Class MONOPLACOPHORA Wenz in Knight, 1952
Order TRYBLIDIOIDA Lemche, 1957
Superfamily TRYBLIDIACEA Pilsbry in Zittel-Eastman, 1899
Family TRYBLIDIIDAE Pilsbry in Zittel-Eastman, 1899
Subfamily PROPLININAE Knight and Yochelson, 1958
Genus Proplina Kobayashi, 1933
Proplina antiqua Kobayashi
1962. Propilina antiqua Kobayashi [error of Proplina], p. 15, pl. 2, figs. 20a, b, 21a, b.
Type. — Holotype (UMUT PM3990, Kobayashi, 1962, pl. 2, figs. 21a, b) from the Eochuangia zone of the Chosen Group at 1.25 km west of Kok-kol, Puk-myon, NNE of Chung-san, South Korea.
Age and distribution. —Middle Cambrian. Known only from the type locality.
Family PALAEACMAEIDAE Grabau and Shimer, 1909
Genus Scenella Billings, 1872
Scenella clotho Walcott
1936. Scenella clotho Walcott: Saito, p. 359, pl. 3, figs. 18, 19.
Age and distribution. —Lower Cambrian. Upper Redlichia shales of the Chosen Group in Chungwa area of Pyongan-namdo (Heian-nan-do), North Korea. This species was known also from the Middle Cambrian of Shan-tung, north China.
Genus Palaeacmaea Hall and Whitfield, 1872
Palaeacmaea hampakuensis Kobayashi
1934. Palaeacmaea hampakuensis Kobayashi, p. 359, pl. 4, figs. 1-4, pl. 5, figs. 10-12.
Type. —Holotype (UMUT PM0566, Kobayashi, 1934, pl. 4, figs. 3, 4) from the Tsuibon beds of the Chosen Group at Saisho-ri, Taebaeksan (Taihakusan) area, Kangwon-do (Kogen-do), South Korea.
Age and distribution. —Middle Ordovician (Llandeilian or Caradocian), Known only from the type area.
Palaeacmaea sohsanensis Kobayashi
1934. Palaeacmaea sohsanensis Kobayashi, p, 359, pl. 5, figs. 5, 6.
Type. —Holotype (UMUT PM0569, Kobayashi, 1934, pl. 5, figs. 5, 6) 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 (Llandeilian or Caradocian). Known only from the type locality.
Palaeacmaea? sp.
1960. Palaeacmaea (?) sp.: Kobayashi, p. 229, pl. 14, fig. 4.
Age and distribution. —Lower Ordovician. Clarkella zone of the Chosen Group in Neietsu area of Kangwon-do (Kogen-do), South Korea.
Phylum uncertain
Class HYOLITHA Marek, 1963
Family HYOLITHIDAE Nicholson, 1872
Genus Hyolithes Eichwald, 1840
Hyolithes cybele Walcott
1962. Hyolithes cybele Walcott: Kobayashi, p. 18, pl. 3, fig. 5.
Age and distribution. —Middle Cambrian. Eochuangia zone of the Chosen Group in Taebaeksan (Taihakusan) area of Kangwon-do (Kogen-do), South Korea. This species was originally described from the Mapanian and Taitzuan Formations of Shantung and Liaotung, China.
Hyolithes globiger Saito
1936. Hyolithvs globiger Saito [sic], p. 361, pl. 3, figs. 13-17.
Type. —Holotype (UMUT PM1482, Saito, 1936, pl. 3, figs. 16, 17) from the limestone near the base of the Ptychoparia beds at the south slope of Ch'ongnyongsan hill, 1.3 km ENE of Chunghwa, Pyongan-namdo (Heian-nan-do), North Korea.
Age and distribution. —Middle Cambrian. Known only from the type locality.
Hyolithes katoi Saito
1936. Hyolithus katoi Saito [sic], p. 361, pl. 3, figs. 20-23.
Type. —Holotype (UMUT PM1477, Saito, 1936, pl. 3, figs. 20-22) from the limestone near the base of the Ptychoparia beds of the Chosen Group at the south slope of Ch'ong nyonganhill, 1.3 km ENE of Chunghwa, Pyongan-namdo (Heian-nan-do), North Korea.
Age and distribution. —Middle Cambrian. Known only from the type locality.
Hyolithes subcarinatus Kobayashi
1935. Hyolithes subcarinatus Kobayashi, p. 73, pl. 3, figs. 19-22.-1952. Hyolithes sub carinatus Kobayashi: Shikama, p, 80, pl. 2, fig, 18 [reproduction of an original figure].
Type. —Syntypes (UMUT PM0945-0947, three specimens) from the Chuangia zone of the Kasetsu Formation of the Chosen Group at Saisho-ri, Taebaeksan (Taihakusan) area, Kangwon-do (Kogen-do), South Korea.
Age and distribution. —Upper Cambrian (Chaumitian). Known only from the type lo cality.
Hyolithes teretapex Saito
1936. Hyolithus teretapex Saito [sic], p. 362, pl. 3, figs. 24-31.
Type. —Holotype (UMUT PM1485, Saito, 1936, pl. 3, figs. 26, 27) from the Protolenus shale, at rail-way cutting immediately south of the tunnel under Kuhyonch'i pass, 2.0 km north of Heukkyo, Koshu area, Huanghae-do (Kokai-do), North Korea.
Age and distribution. —Lower Cambrian. Known only from the type locality.
Hyolithes sp.
1935. Hyolithes a sp.: Kobayashi, p. 73, pl. 2, figs. 8, 9 [only opercula].
Age and distribution. —Lower or Middle Cambrian. Solenoparia zone of the Taiki Formation of the Chosen Group in Doten area, South Korea.
Hyolithes sp.
1935. Hyolithes b sp.: Kobayashi, p. 74, pl. 2, fig. 7 [only operculum].
Age and distribution. —Lower or Middle Cambrian. Solenoparia zone of the Taiki For mation of the Chosen Group in Doten area, South Korea.
Hyolithes sp.
1934. Hyolithes sp.: Kobayashi, p. 374, pl. 44, figs. 7, 8.
Age and distribution. —Middle Ordovician (Caradocian). Tsuibon beds of the Chosen Group in Taebaeksan (Taihakusan) area of Kwangwon-do (Kogen-do), South Korea.
Hyolithes? sp.
1960. Hyolithes(?) sp. indet.: Kobayashi, p. 229, pl. 13, figs. 22a, b.
Age and distribution. —Lower Ordovician. Bunkoku Formation of the Chosen Group in Puk area, South Korea.
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