Fossils from the Upper INIvisashino of Kaziisa and Shimosa. \S\ 



Very frequent at some localities. The largest obtninecl has 

 a height of 90 iiiilliin. 



Fossil occurrence. — (Jtake, Shito (very common), Tega. 

 Sliinagawa and Oji (frequent). Lower Musashino of ^Nliyata, 

 Voko-iuka and Naganuma. 



Living. — Nortliern, C'entral and Western Japan. 



297. Peffen sitbplicafus, Sowerby. 

 PI. XV. Fig. 3. 



Pecten .siibj-iUcntiis. Sowerby, Tlies. Concli., I, p. 64, pi. XIII, fig. 37, pi. XIV, figs. 

 72, 73, 81. Mart, u Chem., Syst. Conchyl. Cab., VII, Pectiuacea, p. 157, pi. 44, 

 tigs, 3-5, Dnuker, Ind. Moll., p. 242. 



Tlie riglit valve of a young individual. It has five radiating 

 folds with a weak one on eacli side of them. The folds as well as 

 the valleys are radially striated. Length 20.5millim. Height 

 22.5 millim. Depth 4 milling. 



Fossil occurrence. — Kioroshi. 



Living. — Westerji .Japan. Philippines. Moluccas. 



29S. JPeefen crassieosfnfus, Lowerby, 



Pecteu crassicostdtiis. Pilsbry, Cat., p. 143. Duiiker, Incl. Moll., p. 239, pi. XIII, fig. 



28. Lischke, Jap. Meerescoiich., T, p. 168. Sowerby, Thes. Couch., I, p. 75, pi. 



XV, fig. Ill, pi. XVII, fig. 152. Yokoyama, Foss. Minra. Penin., p. 158, pi. 



XII, fig. 7. 

 Pecten nobilis. Eeeve, Conch. Icon., Pecten, pi. I, fig. 3. 



A single left valve 1)elonging to a young individual. 



Fossil occurrence. — ïShito. Lower Musashino of Naganuma. 



Living. — Central to Southern Japan. 



29î>. I'ecten resieulttsuti, Danker. 



Pecten vesicitlmus. Danker, Intl. Moll., p. 241, pi. XI, fig. 1. Yokoyama, Foss. Minra 

 Penin., p. 154, pi. XIII, figs. 11, 12, 13. 



Very frequent, hut most of the specimens are water-worn and 

 lack the ears. 



Fossil occurrence. — Shito. Lower Musashino of Koshiba. 

 Li ving. — Central Japan! 



