Fossils from the Upper Musashino of Kazusa and Shimosa. 



11 



179. Dentalium (Pustiai-ia) 

 nipponicus Yok. 



Lamellibranchiata. 

 Family Pholadidac. 



180. Pholas fragil is Sow. 



181. Jouannetia kauiaknrensis 

 Yok. 



Family Saxicavidae. 



182. Panope g-enerosa GJd. 



183. Saxicava orientalis Yok. 



Family Corbulidae. 



184. Corbula erythrodon Lam. 



185. Corbula venusta Gld. 



186. Corbula f requens Yok. 



187. Corbula pustulosa Yok. 



188. Corbula sematensis Yok. 



189. Corbula pyguiœa Yok. 



190. Corbula sub -tricta Yok. 



Family Myacidae. 



191. Crvptomya busoensis 

 Yok". 



Family JMactridac. 



192. Mactra sulcataria Desh. 



193. Mactra veneriiormis 

 Desh. 



194. Mactra ovalina Laui. 



195. Mactra dunkeri Yok. 



196. Mactra sachalinensis 

 Sehr. var. im^jerialis Yok. 



197. Spisula grayana Sehr. 



198. Spisula bernardi Pils. 



199. Raeta yokohamt-nsis Pils. 



200. Raeta pellicula Desh. 



201. Raeta elliptica Yok. 



202. Raeta magnifica Yok. 



203. Tresus nuttalli Conr. 



204. Lutraria maxiuia Jon. 



r- I » 



œ W 



LIVING 



. . + . . . . + . . 



+ + + 



+ 



+ . . + 



+ + + .. + •. 



+ 



. . . . + + + . . 



+ 



+ + ..-. + + 



Northern to Western Japan, 

 Philippines. 



Central Japan. 



Xorthern .Japan, Washington 

 to California. (Fossil in Mio- 

 cene to Pleistocene of the 

 West.) 



Central and Western Japan 

 Northern Japan. 



Central .Japan. 



Northern to Southern Japan. 



North China, Possiet Bay. 

 Northern to Western Japan, 



North China. 

 Central Japan, Puget Sound in 



British Columbia. 



Central Japan. 



Typical form lives in North. 



and Cent. Japan. 

 North. Japan, Behring Sea, 



Massachusetts. 

 Western Japan. 

 Central Japan. 

 Japan (Reeve). 



North, to West. Japan, Alaska 

 to San Diego. (Pliocene and 

 Pleistocene of California). 



Western Japan. 



