Fossils from the filiurâ Peninsula and its [niinendiate North. 1X9 



Family Veneridae. 



Genus Dosinia. ScOPOLl. 



145. Dosinia troscheli, Lischke. 



Pl. VIII. Figs. 5, 6. 



DjsHiiu troscheli. Lischke, Jap. Meeresconch., Ill, p. 89, pl. VIII, figs. 1-3. Dunker, 

 Index Moll., p. 203. 



Dosinia exoleta. Brauns, Geol. Env. Tokio, p. 41, pl. VI. fig. 22. Tokdnaga, Fobs. Env. 

 Tokyo, p. 47. 



Only a few specimens were obtained. 



Brauns and Tokunaga united this s})ecies with the well 

 known Atlantic form Dasinia exoleta L. But there are several dis- 

 tinguishing characters between the two. Dosinia troscheli is 

 somewhat longer and more flattened than Bosi/tia exoleta. Also 

 the posterior end of the former is more angnlate and the anterior 

 end more produced than in the latter. The end of palliai 

 sinus also presents some difference. It is bluntly pointed in the 

 Japanese species, while it is more subtruncate in the European. 

 But, above all, what distinguishes the two on first glance is the 

 presence of an area in our species, while it is absent in Linne 

 species. 



A left valve represented in our figure measures 47 millim. in 

 length, 43 millim. in height and 11 millim. in depth. 



Fossil occurrence: — Miyata Zone (Shimo-Miyata and Nagai) 

 and Naganuma Zone (Naganuma); Upper Musashino of Musashi 

 Shimosa and Kazusa. 



Living: — Central and Western Japan. 



Genus Cyclina, DeshaYES. 



149. Cyclina chinensis, (Chemnitz). 



Pl. XL Figs. 7, 8. 



Cyclina chinensis. Deshayes, Traité Elémentaire, vol. I, pt. 2, p. 626, pl. 14, figs. 20-22. 

 Pfeiffer in Syst. Conch. Cab. Mart. Chemn., vol. XI, pt. 1, p. Ill, pl. 2, fig. 5, pl. 28, fig. 1. 

 Lischke, Jap. Meeresconch., I, p. 126. Brauns, Geol. Env. Tokio, p. 53. 'Tokunaga, Foss. 

 Env. Tokyo, p. 48. 



Venus chinensis. Chemnitz, Conch. Cab., X, p. 356, pl. 171, fig- 1663. 



This is a species which lives in great abundance in the Lay of 

 Tokyo. The fossil specimens are also rather numerous, but most- 



