Eight species of halysitid corals, namely Schedohalysites kitakamiensis (SUGIYAMA), Falsicatenipora shikokuensis NODA and HAMADA, Halysites catenularius (LINNAEUS), H. suessmilchi ETHERIDGE, H. kuraokensis (HAMADA) and three indeterminable species, are described and figured from the Silurian deposits of Mt. Yokokura region in Kochi Prefecture, Southwest Japan. Among them, Halysites spp. A and B may represent new forms although they are imperfect in preservation. Halysites catenularius (LINNAEUS) and H. kuraokensis (HAMADA) are recorded from Mt. Yokokura region for the first time. Also Silurian geology in Mt. Yokokura region is briefly described.
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