FOSSH.S FROM ri[E ENVIRONS OF TOKYO. 41 



103. MXVTUX <K()SSEr Dkr. 



PI. II. Fi,o.s. 27 a and b. 

 DuNKKE, Iiulox j\roll. Mûris Jap., p. 183. 



Oji (rare). 



Living: Tokyo, Komiiiato (Awa or Böshii), Sagami and Kii. 



104. LUIRARTA OVALIS Tok. 

 PI. II. Fi-s. 28 a, b and e. 



Shell oblong, thick, compressed, subequilateral ; the curva- 

 ture very ditî'erent in the anterior and powtejioi' sides ; surface 

 sculptured with fine concentric striations ; iimboues exceedingly 

 anterior in situation. 



JNIy specimens greatly resemble to the European species Lutraria 

 oblonga Lam., but the curvature of the upper margin, and also 

 of the anterior and posterior ends is somewhat different. 



Shinagawa (rare). 



Living : Ajiro (Izu), Hyögo (Settsu) and Köchi (Tosa). 



105. TRESUS Sp. 

 PI. II. Figs. 29 a, b and b'. 



Shell small, oblong; umbilicus nearly at the centre of upper 

 margin ; very low ridge running from the umbilicus to the 

 postero-ventral edge ; palliai sinus deep. Ix^ngth 25'""', height 

 le.O"""", and breadth 10""". 



