iQQ Art. 1. — M. Yukoyania. 



Genus PtlCATDLA, Lamarck. 



294. Pliedtulu eutieafa, Duiiker. 



PL XIV. Fig-. 25. 



Plicatula Guncata. Dunker, Malak. Bl., vol. 24, p. 73. Index Moll, p. 24G, pi. XI, 

 fig. 3. 



A mucfi worn right valve, 12.8 millim. long, 15.4millim. 

 high and 2.6 milHm. deep. It is thick, cuneate in shape and has 

 eight strong, flattened, radiating ribs with narrower interspaces. 

 The ribs seem to have been lamellar wiien fresh. 



Fossil occurrence. — Kamenari. 



Living. — Central and Western Japan. 



Family Pectinidae. 



Genus PECTJEN, Müller. 



295. Pecteti squainafus, (Gmelin). 



Fecten squamatus. Sowerby, Tlies. Conch., I, Pecten, p. 70, pi. XIII, figs. 57, 58. 



Eeeve, Conch. Icon., Pecten, sp. 82. Dunker, Intl. Moll., p. 240, pi. XI, fig. 14. 



Küster, in Syst. Conch. Cab., VII, pt. 2, Sponclylus and Pecten, p. 113, pi. 



XXXII, tig. 4. Yokoyama, Foss. Mmra Pemn., p. 151., pi. XIY, figs. 3, 4. 

 (Xstrea squamata. Gmelm, Syst. Nat., Ed. 13, p. 3329. 



A few right valves of young individuals. They are flattish 

 with a long anterior ear and ornamented with unequal radiating 

 ribs whose interspaces are also unequal. The scales on the ribs 

 are almost wholly Avorn away by friction. 



Fossil occurrence. — Otake, Tega. Lower Musashino of 

 Naganuma. 



Living. — Central and Western Japan. Philippines. 



296. Pecten Itefus, Gould. 

 PI. XIV. Figs. 26. 



Pecten lœtus. Gould, Otia Concb., p. 177. Lischke, Jap. Meeresconch., I, p. 169, pi. 

 XII, figs. 6, 7, II, p. 157. Dunker, Ind. Moll., p. 241'. Schrenck, Moll. Amurl. 

 u. d. nordjap. Meeres, p. 603. Brauns, Geol. Env. Tokio, p. 57. Tokunaga, 

 Foss. Env. Tokyo, p. 65, pi. Y, fig. 2. Yokoyama, Foss. Miura Penin., p. 152, 

 pi. XIV, figs. 1, 2. 



