Fossils from the Upper Musashino of Kazusa and Shimosa. 119 



17S. Ifenfaliuèii efloense, Tokunaga. 



Bentaliuni edoeme. Tokunaga, Foss. Env. Tokyo, p. 34. i^l. II, fig. 17. Yokoyama^ 

 Foss. Miura Peniu., p. 103, pi. YI, fig. 28. 



This apparent!}^ smooth-shelled form is Yeiy frequent at some 

 places, although mostly in fragments. 



Fossil occm-rence. — Otake, Shisui, Tega, Shito. Oji and 

 Shinagawa in Musashi. Lower Musashino of IMiyata, Yokosuka 

 and Naganuma. 



Living. — Central and Western Japan. 



17«. Dentaliiitn (JFustiaria) nippouieutu, Y'^okoj'^ama. 



PL VI. Fig. 7. 



Shell rather small, slightly curved, pretty rapidly growing 

 smooth, circular in section, provided with a deep narrow slit not 

 quite straight and often with the sides not strictly parallel, some 

 parts swelling in hreadth. Posterior opening narrowed, longly ovate. 



The specimens, though numerous, are more or less hroken 

 at the larger end. Tlie largest measures 27 milhm. in length, and 

 3 millim. in diameter (larger end) with the slit 4 millim. in length. 



Fossil occurrence. — Shito. 



Class LAMELLIBRANCHIATA. 



Order Teleodesmacea. 



Family Pholadidae. 



Genus PHOtAS, Linné. 

 ISO. Phot fis f raff His, Sowerby. 



Pholas fmrjilis. Sowerby, Tbes. Couch., vol. II, p. 488, pi. 108, figs. 92, 93. Lisclike, 

 Jap. Meeresconch., I, p. 143. Yokoyama, Foss. Miura Peiiin,, p. 104, pi. YI, 

 fig. 29. 



Bameafrofjilis. Dunker, lud. Moll., p. 170. 



A riglit valve not quite perfect. Its anterior end is obtusely 

 pointed. 



Fos-il occurrence. — (Jtake. Lower Musashino of Yokosuka. 

 Livino-. — Northern and Wotern Japan. Philippines. 



