Fossils from the Upper Musasliino of Kazusa and Shimosa. \QY 



Fossil occurrence. — Otake, Shisui, Kamenari, Tega, Shito. 

 'I'okunaga mentions this species from Tabata. Takigashira near 

 Yokohama according to Brauns. 



Living. — Central and Western Japan. China. Philippines. 

 Indian (Jcean. 



S1:î. .4.re€t (AttoHialoearditi) hiflatn, Eeeve. 

 PL XV. Ficv. 9. 



Area {Anomalocanlia) iii/lata. Pilsbry, Cat. p. 141). Kobelt in Syst. Couch. Cab., 



Ylir, pt. 2, p. 80, pi. X, figs. 1, 2. 

 Area iiirîata. Reeve, Conch. Icou., Area, sp. 80. Yokoyama, Foss. Minra Peiiiu., p. 



167, p]. XYII, fig. 9. 

 Area hrmiijhtonii. Schrcnck, Moll. Amurl. n. d. nordjap. Meeres, p. 575, pi. 24, figs. 



1-S. 

 Area tcnuU. Tokiuuiga, Foss. Env. Tokyo, p. 58, pi. lY, fig. 1. 



Some specimens are quite thin-shelled whicli induced Toku- 

 naga to establish a new species which he called A. tenuis. The 

 largest attains a length of more than 110 millim. 



Fossil occurrence. — Otake, k^liisui (frequent), Shito. Oji, 

 Tabata and Shinagawa. Lower Musashino of Naganunia. 



Living. — Northern, Ceutral and Western Japan. Phihppines. 



31 1. Afva (Scaphat'ca) suhvt'eÈiata, Lischke. 

 PI. XV. Fi^^ 12. 



Area {Scapliarea) suherenata. Kobelt in Syst. Conch. Cab., YIII, pt, 2, p. 47, pi. XIII, 

 figs. 5, 0. Pilsbry, Cat., p. 149. Yaiuakawa, Fossil Scapharca of the Neigh- 

 bourhood of Tokyo, Jour. Geol. Soc. Tokyo, 1912, vol. XYItl, no. 219, p. 0. pi. 

 Ill, lY. figs. 1-12. 



Area aaherenata. Lischke, Jap. Meeresconch., I, p. 140, pi. IX, figs. 1-8. 



Scapharca sulicrenata. Dunker, Ind. Moll., p. 284. 



Area /.atjo.shiiiiensi.s. Tokunaga, Foss. Env. Tokyo, p. 59, pi. Ill, fig. 21. 



Distinguished from the preceding species by a less number of 

 radiating ribs (twenty-eight to thirty-six, while in A. inflata 

 usually over forty) and their subcrenate nature which in the left 

 valve is seen on all the ribs anterior to the posterior cai'ina, and 



