Fossils îvom the Upper Mosasliino of Kazusa aud SUiuiosa. 185 



:$or. Östren iïenselainellos€i, List-like. 



Ostrca dem-elamellnsa. Lischke, Jap. Meevesconch., I, p. 79, pi. XlII, pi. IV, fig. 1. 

 Brauos, Geol. Eav. Tokio, p. 58. Pilsbiy, Cat., p. 146. Tokuuaga, Foss. Euv. 

 Tokyo, p. 68, pi. IV, fig. 6. Yokoyama, Foss. Minra Penia., p. 162, pi. XVI, 

 fig. 6. 



A few but good specimens of the lower valve. 



Fossil occurrence.— CJtake, Tega. Oji and Sliinagawa. Lower 



Musashino of Yokosuka. 



jj^.ij^g__Northern, Central, Western and ï^outhern Japan. 



30<S. Ostrea ntusashiaiia, Yokoyama. 

 PL XV. Fig. 5. 

 n,t,ra wMsashiana. Yokoyama, Foss. Miura Penin., p. 163, pi, XVI, figs. 1-5. 



A few specimens. The shell is thin and usually more or less 

 longly ovate, with the lower valve strongly convex. 



Fossil occurrence.— Otake, Shito. Lower Musashino of Yoko- 

 suka and Koshiba. 



Family Pinnid«. 

 Genus PINNA, Linné. 

 a09. Pinna japoniea, Hanley. 

 PI. XV. Fig. 8. 

 Pinna jiponicu. Hanley, Proc. Zool. Soc. 1858. p. 136. Reeve, Coucli. Icon., fig. 

 47. Küster in Syst. Concliyl. Cab., VIII, pt. 1, p. 72, pi. 24, fig. 3, pi. 29, fig. 1. 

 Pilsbry, Cat., p. 147. 

 Only a fragment belonging to the beak-portion. It is, however, 

 easily recognized b)y its thin shell, distant radiating costulae and 

 concentric corrugations as the above named species. 

 Fossil occurrence. — Shito. Oji in .Musaslii. 

 Living. — Central and Western Japan. 



Family Arcidae. 



Genus ARCA, Lamarck. 



310. Area hobeltiana, Pilsbry. 



Area hobeltiana. Pilsbry, New .Jap. Mar. Moll., Pelec, Proc. Acack Nat. Sei. Pbil., 



