FOSSILS FROM THE ENVIRONS OF TOKYO. 05 



( )ji (frequent), Shinngawa (rare). 



Living specimens are very common in Japan, Init their 

 occurrence is limited to the western coast of the Nortli Pacific 

 Ocean aiul to the north-west coast of N. America, probably not 

 extending far from California. In Japan tliey occur in the 

 following places : Tokyo Bay, Misaki and Koajiro (Sagami), 

 Ajiro (Izii), Chöshi (Shimösa), Hakodate, Sapporo, Enoura 

 (Suruga), Takashima (Kii), Futamiga-ura (Ise), Sakai (Settsu), 

 Osaka, Kobe, Tsuruga (Echizen), Tomo (Bingo), Awaji, Miya- 

 jima (Aki), Gönoura (Iki), Nagahama (lyo), Asamiwan (Tsu- 

 shima), Nagasaki, Kanze ^Satsuma), Kagoshima, and Loochoo Is. 



159. TECTEN LJ^TUS Gld. 



PI. IV. Fig. 2. 



LiscHKE, Jap. Meei-es-Coiicli., I., p. 169, and II., p. 157. — Schrenck, 

 Moll. Amurl. and Nord-Jap. Meeres, p. 603. — Brauns, Geol. Env. 

 Tokio, p. 57. — PiLSBRY, Cat. Mar. Moll. Jap., p. 143. 



Sliinagawa and ( )ji (frequent). 



Living : Tokyo Bay, Jögashima (Sagami), Chöshi (Shimösa), 

 Hakodate, Rikuzen and Nagasaki. 



160. PECTEN TOKYOENSIS Tok. 



PL V. Figs. 1-10. 



Brauns, Geol. Env. Tokio, p. 48. — Sowerby, Thes. Conch., I., p. 65. — 

 Syst. Conch. Cal)., VIII. 2, p. 256. 



Shell very large reaching 150°"" in length, equilateral, in- 

 equivalved, thin, nearly round in outline. Kight valve strongly 

 swollen; surface with undulating ribs and furrows; ribs very 



