1 8(5 -â-rt. 1. — M. Yokoyaraa : 



July, 1904, p. 559, pi. XI, figs. 16-19. Yokoyaina, Foss. Miura Penin., p. 1G3, 



pi. XVII, fig. 4. 

 Area occUata. Kobelt in Syst. Concb. Cab., vol. VIII, p. 87, pi. 24, figs. 1-4 (non 



Eeeve). Pilsbry, Cat., p. 148. 

 Area rcetamiidaris. Tokunaga, Foss. Env. Tokyo, p. 61, pi. Ill, fig. 28. 



This shell has already been described from tlie Lower ^Iiisa- 

 shiiio. 



Fossil occurrence. — Otake, Shito (frequent). Lower Älusa- 

 shino of Miyata, Yokosuka, Kanazawa and Koshiba. 



Living. — Northern and Central Japan. 



311. AlVcu sf/iiitnetrica, Ileeve. 



Area stimmet rka. Reeve, Conch. Icon., Area, sp. 117. Yokoyama, Foss, Miura I'euiu., 

 p. 16G, pi. XVII, figs. 7, 8. 



A few isolated valves much worn by friction. 



Fossil occurrence. — Otake. Lower Musashino of Yokosuka 

 and Naganuma. 



Living. — Central and Western Japan. Phihppines. Indian 

 Ocean. 



312. Area (Ationm/oearfl ifi) yranosa, Linné. 

 PI. XV. Fi<^-. 4. 



Area {A)iomalov(irilia) (jranom. Pilsbry, Cat., p. 149, Kobelt in Syst. Conch. Cab., 



VIII, pt. 2, p. 38, pi. Ill, fig. 7. 

 Area (jranosa. Linné, Syst. Nat., Ed. 12, p. 1142. Reeve, Conch. Icon., Area, spec. 



15, Lischke, Jap. Meeresconcb.; I, p. 145. Tokunaga, Foss. Env. Tokyo, p. 59, 



pi. Ill, fig. 20. 

 Anomalocardia ijranosa. Dunker, Ind. Moll., p. 233. 



Isolated valves from several localities which are not quite full- 

 grown. The largest is onl}^ 55 millim. in length. This species is 

 easih^ recognized by its thick, solid, swollen, somewliat oblique 

 shell (jrnamented with coarse granular radiating ribs whose number 

 in the fossil is seventeen or eighteen. It is here to be remarked 

 that the fossil specimens are a little more oblique and the postero- 

 ventral corner more produced than that represented in the figure of 

 Kobelt. 



