134 Art. 1.— M. Yokoyama : 



Fossil üccurrence, — (Jtake (frequent), Kioroshi, Shito. 

 Living. — Western Japan. 



Family Solcnidae. 



Geiiub SOL.E1V, Linné. 



20.>. So/en f/rantlis, Duiiker. 



PI. IX. Fig. 1. 



Solen [imndis. Duuker, Nov. Conch., II, p. 71, pi. XXIV, fig. 5. lad. Moll., p. 172: 

 Lisclike, Jap. Meeresconch., I, p. 141. Mart. n. Chem., Syst. Couch. Cab., 

 XI, part 3, Solenaceae, p. 18, pi. VII, fig. 1. Pilsbry, Cat., p. 190. 



This splendid shell is either straiglitly truncate or slightly 

 concave in front, while it is rounded behind. The length is 4.3-4.4 

 times the height. The largest specimen obtained measures 135 

 miillim. in length, 30 millim. in height and 18.5 millim in 

 thickness. 



Brauns in his "Geology of the Environs of Tokio " (p. 56) 

 says that this species is very frequent at Oji, but as not a single 

 specimen has since been found, it is very likely that he mistook 

 the next species for it. 



Fossil occurrence. — Otake (very frequent), Tega. 



Living. — Western Japan. Phili})pines. 



sou. Soleil hfuseitsfei'itii. Schrenck. 

 PL IX. Fig. 5. 



Solen hruserinternii. Schrenck, Moll. Amurl. u. d. nordjap. Meeres, p. 594, pi. XXV, 

 figs. 9-12. Pilsbry, Catalogue, p. 190. Tokunaga, Foss. Env. Tokyo, p. 36, pi. 

 II, fig. 19. 



Ensis kntsensteniii. Duuker, Ind. Moll., p. 173, 



Although smaller in size than the preceding, this species is 

 comparatively longer, and also somewhat longer than the living 

 specimens. Schrenck says tliat the length is about four times and. 



