Fig. 13. C'ijlichna acuta Tok. (Magnitied). 



Fig. 14. Cylichna obtusa Tok. (Magnified). 



Figs. 1.5 a and h. Dentaliwn uctogonum Lamk. (Nat. size). 



Figs. 16 a and b. Dentalium loeinliauß Dkr. (Nat. size). 



Fig. 17. Dentalium edœnsis Tok. (Nat. size). 



Fig. 18. 3Iartesia striata Linné, (Nat. size). 



Fig. 19. Solen krausensternii Schrenck. (Nat. size). 



Figs. 20 a and h. 3Iacha divaricata LivE. (Nat. size). 



Figs. 21 a and h. Saxicava arctica üesh, (Nat. size). 



Figs. 22 a, a', h and b'. Corbtda venusta Gld. (Figs. 22 a and b in natural 



size ; figs. 22 a' and b' magnified). 

 Figs. 23 a and b. Neœrea gouldiana Hinds. (Magnified). 

 Figs. 24 a and b. Myodora fluctuosa Glu. (Nat. size). 

 Figs. 25 a and b. 3Iactra sacJialinensis Schrenck. (Nat. size). 

 Figs. 26 (A and b. 3Iaetra sulcataria Desk. (Nat. size). 

 Figs. 27 a and b. 3Iactra crossei Dkr. (Nat. size). 

 Figs. 28 a, b and c. Lidraria ovalis Tok. (Nat. size). 

 Figs. 29 a, b and b'. Lidraria sp. (Figs. 29 a and b in natural size; fig. 



29 b' magnified). 

 Figs. 30 a, a', b and b'. Tellina nitidtda Dkr. (Figs. 30 a and b in natural 



size ; figs. 30 a' and b' magnified). 

 Figs. 31 a and a' Tellina yedœnsis Lke. (Fig. 31 « in natural size; fig. 



31 /; magnified). 

 Figs. 32 a, a' and b. Tellina serricodala Tok. (Figs. 32 a and b in natural 



size ; fig. 32 a' magnified). 

 Figs. 33 a and a'. Tellina ienera Say. (Figs. 33 a in natural size ; fig. 



33 a' magnified). 

 Figs. 34 a, a' and b. Tellina ojiana Tok. (Figs. 34 a and b in natural 



size, fig. 34 a' magnified). 

 Figs. 35 a and a'. Tellina aff. rutile Dkr. (Fig. 35 a in natural size ; 



fig. 35 rt' magnified). 

 Figs. 36 a and (//. Tellina vipponica Tok. (Fig. 36 a in natural size ; 



fig. 36 cd magnified). 



