Ctenodonta corbuliformis Kobayashi
1934a. Ctenodonta corbuliformis Kobayashi, p. 349, pl. 3, figs. 7, 22, 23.
Type. —Syntypes (UMUT PM0546-PM0548, three specimens) from the Chikunsan beds of the Chosen Group at Makkol and Tsuibon bed of the same group at Kochi-ri, Taebaeksan (Taihakusan) area, Kangwon-do (Kogen-do), South Korea.
Age and distribution. —Middle Ordocivian (Llandeilian-Caradocian). Known only from the type area.

Ctenodonta coreanica Kobayashi
1934a. Ctenodonta coreanica Kobayashi, p. 347, pl. 3, figs. 16, 17, pl. 4, fig. 17.
Type. —Holotype (UMUT PM0540, Kobayashi, 1934a, pl. 3, fig. 16) from the Chikunsan beds of the Chosen Group at Makkol, and Tsuibon beds of the same group at Saisho-ri and Kochi-ri, Taebaeksan (Taihakusan) area, Kangwon-do (Kogen-do), South Korea.
Age and distribution. —Middle Ordovician (Llandeilian-Caradocian). Known only from the type area.

Ctenodonta dotensis Kobayashi
1934a. Ctenodonta dotenensis Kobayashi, p. 347, pl. 4, fig. 18.
Type. —Holotype by monotypy (UMUT PM0539, Kobayashi, 1934a, pl. 4, fig. 18) from the Tsuibon beds of the Chosen Group at Doten-ri, Taebaeksan (Taikahusan) area, Kangwon-do (Kogen-do), South Korea.
Age and distribution. —Middle Ordovician (Caradocian). Known only from the type lo cality.

Ctenodonta nasutaformis Kobayashi
1934a. Ctenodonta nasutaformis Kobayashi, p. 346, pl. 4, figs. 13-15.
Type. —Holotype (UMUT PM0537, Kobayashi, 1934a, pl. 4, figs. 13, 14) from the Tsuibon beds of the Chosen Group at Keizan-son, Taebaeksan (Taihakusan) area, Kangwon-do (Kogen-do), South Korea.
Age and distribution. —Middle Ordovician (Caradocian). Known only from the type area.

Ctenodonta nipponica Kobayashi [Pl. 9, Figs. 1a, b]
1934a. Ctenodonta nipponica Kobayashi, p. 345, pl. 3, figs. 1-3, pl. 4, fig. 16.
Type. —Holotype (UMUT PM0535, Kobayashi, 1934a, pl. 3, figs. 1-3) from the Chikun san beds of the Chosen Group at Makkol, Taebaeksan (Taihakusan) area, Kangwon-do (Kogen-do), South Korea.
Age and distribution. —Middle Ordovician (Caradocian). Known only from the type locality.

Explanation of Plate 9 Fig. 1. Ctenodonta nipponica Kobayashi. Holotype (UMUT PM0535). Left internal mould (la) and upper side view of the same specimen (1b), × 1.5. Loc. Makkol. Kangwon-do (Middle Ordovician, Chikunsan beds of the Chosen Group). Fig. 2. Pseudoactinodontophora yabei Murata; type-species of genus Pseudoactinodontophora. Holotype (IGPS no. 86885). Rubber cast of right internal mould (2a) and left internal mould of the same individual (2b), × 1. Reproduced from Murata, 1971, pl. 14, figs. 4, la. Loc. Motoiwazawa, Iwate Pref. (Lower Permian, Sakamotozawa Formation). Fig. 3. Cleionychia oviformis Kobayashi. Holotype (UMUT PM0553). Left valve, × 3. Loc. Kochi-ri, Kangwon-do (Middle Ordovician, Tsuibon beds of the Chosen Group). Fig. 4. Modiolopsis kogenensis Kobayashi. Paratype (UMUT PM0557). Left valve, × 3. Loc. S aisho-ri, Kangwon-do (Middle Ordovician, Chikunsan beds of the Chosen Group). Fig. 5. The same species. Holotype (UMUT PM0556). Right valve, × 3. Loc. Makkol, Kangwon-do (Middle Ordovician, Chikunsan beds of the Chosen Group). Fig. 6. Palaeoconcha? samenoha (Kobayashi). Syntype (UMUT PM0544). Right(?) internal mould, × 3. Loc. Makkol, Kangwon-do (Middle Ordovician, Chikunsan beds of the Chosen Group). Fig. 7. Aviculopecten?. onukii Murata. Holotype (IGPS no. 91380). Rubber cast of left externa mould, × 1.2. Loc. Senmatsu, Iwate Pref. (Upper Permian, Toyoma Formation). Fig. 8. Limipecten bandoi Murata. Holotype (IGPS no. 91384). Rubber cast of right external mould, × 1. Loc. Nagahata, Miyagi Pref. (Upper Permian, Toyoma Formation). Fig. 9. Hayasakapecten reticularis (Hayasaka). Holotype (IGPS no. 22227). Left valve, × 1.5. Loc. Kinshozan, Gifu Pref. (Middle Permian, Akasaka Limestone). Fig. 10. Hayasakapecten minoensis (Hayasaka). Lectotype (IGPS no. 8204). Left valve, × 1.2. Loc. Kinshozan, Gifu Pref. (Middle Permian, Akasaka Limestone). Fig. 11. Parallelodon (Parallelodon) obsoleliformis Hayasaka. Lectotype (IGPS no. 22392). External view (11a) and internal view (11b) of left valve, × 1.5. Loc. Kinshozan, Gifu Pref. (Middle Permian, Akasaka Limestone). Fig. 12. Goniophora (Cosmogoniophora) orientalis Kobayashi. Holotype (UMUT PM0562). Left valve, × 3, Loc. Kochi-ri, Kangwon-do (Middle Ordovician, Tsuibon beds of the Chosen Group).

Ctenodonta oblongata Kobayashi
1934a. Ctenodonta oblongata Kobayashi, p. 350, pl, 3, fig. 21, pl. 4, fig. 12.
Type. —Holotype (UMUT PM0549, Kobayashi, 1934a, pl. 4, fig. 12) from the Chikunsan beds of the Chosen Group at Makkol, Taebaeksan (Taihakusan) area, Kangwon-do (Kogen-do), South Korea.
Age and distribution. —Middle Ordovician (Llandeilian). Known only from the type locality.

Ctenodonta? striata Kobayashi
1934a. Ctenodonta (?) striata Kobayashi, p. 351, pl. 4, fig. 11
Type. —Lectotype here designated (UMUT PM0550, Kobayashi, 1934a, pl. 4, fig. 11) from the Tsuibon beds of the Chosen Group at Kochi-ri, Taebaeksan (Taihakusan) area, Kangwon-do (Kogen-do), South Korea.
Age and distribution. —Middle Ordovician (Caradocian). Known only from the type locality.

Ctenodonta? sp.
1934a. Ctenodonta (?) sp.: Kobayashi, p. 352, pl. 4, fig. 19.
Age and distribution. —Middle Ordovician (Llandeilian). Chikunsan beds of the Chosen Group in Taebaeksan (Taihakusan) area of Kangwon-do (Kogen-do), South Korea.

Palaeoconcha? samenoha (Kobayashi) [Pl. 9, Fig. 6]
1934a. Ctenodonta samenoha Kobayashi, p. 348, pl. 3, figs. 10, 11.
Type. —Syntypes (UMUT PM0544, 0545, two specimens) from the Chikunsan beds of the Chosen Group at Makkol, Taebaeksan (Taihakusan) area, Kangwon-do (Kogen do), South Korea.
Age and distribution. —Middle Ordovician (Llandeilian). Known only from the type lo cality.

Palaeoconcha? subsymmetrica (Kobayashi)
1934a. Ctenodonta subsymmetrica Kobayashi, p. 348, pl. 4, figs. 7, 8.
Type. —Holotype (UMUT PM0543, Kobayashi, 1934a, pl. 4, figs. 7, 8) from the Tsuibon beds of the Chosen Group at Kochi-ri, Taebaeksan (Taihakusan) area, Kangwon-do (Kogen-do), South Korea.
Age and distribution. —Middle Ordovician (Caradocian). Known only from the type lo cality.

Nuculopsis (Nuculopsis) orientalis Ichikawa
1951. Nuculopsis (Palaeonwula) orientalis Ichikawa, p. 322, pl. 1, fig. 1.-1967. Nuculopsis (Nuculopsis) orientalis Ichikawa: Nakazawa, p. 167.
Type. —Holotype (UMUT PM5311, Ichikawa, 1951, pl. 1, fig. 1) from the Katsura Formation at Katsura, Sakawa-cho, Takaoka-gun, Kochi Prefecture.
Age and distribution. —Upper Permian (stage unknown). Known only from the type locality.

Nuculopsis (Nuculopsis) sp.
1951. Nuculopsis (Palaeonucula) a sp.: Ichikawa, p. 323, pl. 1, fig. 2.-1967. Nuculopsis (Nuculopsis) sp.: Nakazawa, p. 167.
Age and distribution. —Upper Permian (stage unknown). Katsura Formation in Sakawa area of Kochi Prefecture.

Nuculopsis (Nuculanella) sp.
1951. "Nucula" sp.: Ichikawa, p. 321, pl. 1, fig. 14.-1967, Nuculopsis (Nuculanella) sp.: Nakazawa, p. 167.
Age and distribution. —Upper Permian (stage unknown). Katsura Formation in Sakawa area of Kochi Prefecture.

Nucula? sp.
1934a. Nucula (?) sp.: Kobayashi, p. 351.
Age and distribution. —Middle Ordovician (Caradocian). Tsuibon beds of the Chosen Group in Taebaeksan (Taihakusan) area, Kangwon-do (Kogen-do), South Korea.

Nucula? sp.
1967. Nucula aff. subnuda d'Orbigny: Yanagisawa, p. 93, pl. 1, fig. 14.
Age and distribution. —Middle Permian (Kazanian or thereabout). Kashiwadaira Forma tion of the Takakurayama Group in Yotsukura area of Fukushima Prefecture.

Nucula? sp.
1967. Nucula sp.: Yanagisawa, p. 93, pl. 2, fig. 4.
Age and distribution. —Middle Permian (Kazanian or thereabout). Kashiwadaira For mation of the Takakurayama Group in Yotsukura area of Fukushima Prefecture.

Nuculites ichikawai Nakazawa and Newell
1968. Nuculites ichikawai Nakazawa and Newell, p. 35, pl. 1, figs. 1, 2.
Type. —Holotype (UK, not registered, Nakazawa and Newell, 1968, pl. 1, fig, 1) from the Katsura Formation at Katsura, Sakawa-cho, Takaoka-gun, Kochi Prefecture.
Age and distribution. —Upper Permian (stage unknown). Known only from the type locality.

Nuculites kimurai Hayasaka
1924. Nuculites kimurai Hayasaka, p. 49, pl. 6, figs. 4-7.
Type. —Holotype by monotypy (IGPS no. 22418, Hayasaka, 1924, pl. 6, figs. 4-7) from the Toyoma Formation at Myojinyama, Ogachi-cho, Monoo-gun, Miyagi Prefecture. This specimen was once regarded as a "syntype" by Hanzawa, Asano and Takai (1961, p. 264), but it is clear that Hayasaka originally described this species on the basis of a solitary specimen.
Age and distribution. —Upper Permian (Tartarian). Known only from the type locality.

Nuculites? suboblongatus Kobayashi
1934a. Nuculites (?) suboblongatus Kobayashi, p. 351, pl. 4, fig. 20.
Type. —Holotype (UMUT PM0551, Kobayashi, pl. 4, fig. 20) from the Chikunsan beds of the Chosen Group at Makkol, Taebaeksan (Taihakusan) area, Kangwon-do (Kogen do), South Korea.
Age and distribution. —Middle Ordovician (Llandeilian). Known only from the type lo cality.

Palaeoneilo ogachiensis Hayasaka
1924. Palaeoneilo ogachiensis Hayasaka, p. 49, pl. 6, figs. 8-12.
Type. —Syntypes (IGPS, not registered, two specimens) from the Toyoma Formation at Myojinyama, Ogachi-cho, Monoo-gun, Miyagi Prefecture.
Age and distribution. —Upper Permian (Tartarian). Known only from the type locality.

Palaeoneilo sp.
1951. Palaeoneilo sp.: Ichikawa, p. 320, pl. 1, figs. 3a, b.
Age and distribution. —Upper Permian (stage unknown). Katsura Formation in Sakawa area of Kochi Prefecture.

Palaeoneilo? sp.
1968. Palaeoneilo?sp.: Nakazawa and Newell, p. 36, pl. 1, fig. 3.
Age and distribution. —Upper Permian (Tartarian). Middle part of the Maizuru Group in Maizuru area of Kyoto Prefecture.

Phestia? (Polidevcia?) sp.
1968. ?Phestia (Polidevcia) sp.: Nakazawa and Newell, p. 38, pl. 1, figs. 4a, b.
Age and distribution. —Upper Permian (Tartarian). Middle part of the Maizuru Group in Maizuru area of Kyoto Prefecture.