Murchisonia? sp.
1971. "Murchisonia" n. sp.: Murata, p. 107, pl. 13, figs. 7-10.
Age and distribution. —Lower Permian (Sakmarian). Upper part of the Sakamotozawa Formation in Sumita area of Iwate Prefecture.

Murchisonia? spp.
1966. "Murchisonia" sp.: Masutomi and Hamada, p. 67, pl. 34, fig. 1 [no written description].
Age and distribution. —Middle Permian (Kazanian). "Kuro zone" of the Akasaka Lime-stone in Akasaka area of Gifu Prefecture.
Remarks. —Four specimens illustrated by Masutomi and Hamada (1966) seem to be separable into two different species: the 1st and 3rd specimens from the left may belong to one species and the 2nd and 4th ones to another. The upper position of selenizone on the whorl is strange for Murchisonia and other genera of the Murchisoniidae.

Clisospira? chundongensis Kobayashi
1931. Clisospira (?) chundongensis Kobayashi, p. 37, pl. 1, figs. 12a, b.
Type. —Holotype by monotypy (UMUT PM0193, Kobayashi, 1931, pl. 1, figs. 12a, b) from the Shorin beds of the Chosen Group at Chundong near Kenjiho, Koshu-gun, Huanghae-do (Kokai-do), North Korea.
Age and distribution. —Lower Ordovician (Arenigian or Llanvirnian). Known only from the type locality.

Clisospira shorinensis Kobayashi
1931. Clisospira shorinensis Kobayashi, p. 37, pl. 2, figs. 10a-c.
Type. —Holotype (UMUT PM0192, Kobayashi, 1931, pl. 2, figs. 10a-c) from the Shorin beds of the Chosen Group at Chundong near Kenjiho, Koshu-gun, Huanghae-do (Kokai-do), North Korea.
Age and distribution. —Lower Ordovician (Arenigian or Llanvirnian). Known only from the type locality.

Natiria? infrequens (Kobayashi and Ichikawa)
1952b. Naticella (?) infrequens Kobayashi and Ichikawa, p. 271, pl, 10, figs. 1-4
Type. —Holotype (UMUT MM5403a, Kobayashi and Ichikawa, 1952b, pl. 10, figs. 1, 2) from the upper division of the Nariwa Group at Yamamoto, Nariwa-cho, Kawakami-gun, Okayama Prefecture.
Age and distribution. —Upper Triassic (Norian). Known only from the type locality.

Natiria? japonica (Hayasaka)
1943. Naticella japonica Hayasaka, p. 41, pl. 4, fig. 6.-1952. Naticella japonica Hayasaka: Shikama, p. 180, pl. 52, fig. 10 [reproduction of original figure].-1953. Naticella japonica Hysk.: Hayasaka and Hayasaka, p. 39.-1970. Naticella japonica Hayasaka: Shikama, p. 100, pl. 27, fig. 12 [reproduction of original figure].
Type. —Holotype by monotypy (Taipei University, Hayasaka, 1943, pl. 4, fig. 6) from the Neoschwagerina zone of the Akasaka Limestone at Kinshozan, Akasaka-cho, Fuwa-gun, Gifu Prefecture.
Age and distribution. —Middle Permian (Kazanian). Known only from the type locality.

Natiria? sp.
1954. Naticella (?) sp.: Ichikawa, p. 64, pl. 7, fig. 13.
Age and distribution. —Middle or Upper Triassic (stage unknown). Arai Formation in Hinode area of Tokyo Prefecture.

Paraturbo kumasoana (Matsumoto) [Pl. 5, Fig. 3]
1938. Astraea (s. 1.) kumasoana Matsumoto, p. 19, pl. 2, fig. 9.
Type. —Lectotype here designated (UMUT MM7743, Matsumoto, 1938, pl. 2, fig. 9) from the upper part of the Goshonoura Group at loc. G-125, Hokigahana, Goshonoura island, Amakusa-gun, Kumamoto Prefecture.
Age and distribution. —Upper Cretaceous (Cenomanian). Known only from the type locality.

Explanation of Plate 5 Fig. 1. Otostoma japonicum (Nagao). Holotype (GMH no. 6763). Apertural view (la), adapertural view (1b), upper side view (1c), × 1.5. Loc. Hiraiga, Iwate Pref. (Lower Cretaceous, Hiraiga Formation of the Miyako Group). Fig. 2. Lepidotrochus hataii(Hayasaka). Syntype (IGPS no. 87303), Adapertural view, × l.Loc. Hamada, Miyagi Pref. (Middle Triassic, Rifu Formation). Fig. 3. Paraturbo kumasoana (Matsumoto). Lectotype (UMUT MM 7743). Adapertural view, × 1. Loc. Goshonoura island, Kumamoto Pref. (Upper Cretaceous, Goshonoura Group). Fig. 4. Nododelphinula elegans Nagao. Apertural view (4a), upper side view (4b) and lower side view (4c), × 1. Loc. Hiraiga, Iwate Pref. (Lower Cretaceous, Hiraiga Formation of the Miyako Group). Fig. 5. Spiromphalus yabei Hayasaka: type-species of genus Spiromphalus, Syntype (Taipei Univ.?). Adapertural view, × 6. Reproduced from Hayasaka, 1939, pl. 3, fig. 3. Loc. Kinshozan, Gifu Pref. (Middle Permian, Akasaka Limestone). Fig. 6. Raha? yabei (Hayasaka). Syntype (Taipei Univ.). Reproduced from Hayasaka, 1943, pl. 4, fig. 2. × 0.8. Loc. Kinshozan, Gifu Pref. (Middle Permian, Akasaka Limestone). Fig. 7. Pseudomelania (Psendomelania) elegantula Nagao. Syntype (GMH no. 7062). Apertural view (internal mould), × 1. Loc. Hiraiga, Iwate Pref. (Lower Cretaceous, Hiraiga Formation of the Miyako Group). Fig. 8. The same species. Another syntype (GMH no. 7062). Adapertural view (internal mould), × 1. Loc. ditto.

Lepidotrochus? hataii Hayasaka [Pl. 5, Fig. 2]
1966. Lepidotrochus (?) hataii Hayasaka, p. 29, pl. 1, figs. 4, 5.-1970. Lepidotrochus (?) hataii Hayasaka: Shikama, p. 212, pl. 83, fig. 8 [reproduction of an original figure].-1976c. Lepidotrochus? hataii Hayasaka: Murata, pl. Tr-11, fig. 5.
Type. —Syntypes (IGPS no. 87303, two specimens) from the Rifu Formation at about 1 km northwest of Hamada JNR station, Shiogama City, Miyagi Prefecture.
Age and distribution. —Middle Triassic (Ladinian). Known only from the type locality.

Nododelphinula elegans Nagao [Pl. 5, Figs. 4a-c]
1934. Nododelphinula elegans Nagao, p. 232, pl. 33, figs. 1, 1a-c, 2, 2a-c, 8.-1952. Nodo-delphinula elegans Nagao: Shikama, p. 128, pl. 26, figs. 12a, b [reproduction of original figures].-1966. Nododelphinura elegans Nagao [typographical error of Nododelphinula]: Masutomi and Hamada, p. 143, pl. 72, fig. 2.-1968. "Nododelphinula" elegans Nagao: Hanai, Obata and Hayami, pl. 4, fig. 6.-1970. Nododelphinula elegans Nagao: Shikama, p. 100, pl. 27, figs. 6a, b [reproduction of original figures].-1972. Nododelphinula elegans Nagao: Hashimoto, Hayami and Noda, pl. 10, figs. 8a, b.
Type. —Holotype (GMH? missing, Nagao, 1934, pl. 33, figs. 1, 1a-c, originally designated as "type") from the Hiraiga Formation of the Miyako Group at Haipe near Hiraiga, Tanohata-mura, Shimohei-gun, Iwate Prefecture.
Age and distribution. —Lower Cretaceous (Aptian). Hiraiga Formation of the Miyako Group in Tanohata area of Iwate Prefecture.

Nododelphinula sp. aff. N. elegans Nagao
1972, Nododelphimila sp. aff. N. elegans Nagao: Hashimoto, Hayami and Noda, pl. 10, fig. 7 [no written description].
Age and distribution. —Lower Cretaceous (stage unknown). Gumizaki Formation in Gumizaki area of Kagoshima Prefecture.