40 ART. 2. — S. TOKUNAOA. 



What Brauns designated by tlie name of M. sachalinensis 

 ScHRENCK is 31. sulcataria Desh., as I am now fully convinced. 



Oji (rare). 



Living : Knjüknrihama (Shimôsa), Hakodate, Otnrn (Hok- 

 kaido), Dili Choji and Wjatclui (West Coast of Sakhalin), Kaisen- 

 haufen and Castries Bay (Mandschurian Coast of North Japa- 

 nese Sea). 



This species which is conspicuous for its large shell appears 

 to have its southern limit at Chöshi (Shimösa). 



101. MACTRA VENERTTORMIS Desh. 



Brauns, Geol. Env. Tokio, p. 38. — Lischke, Jap. ]\reeres-Conch., I., p. 



153, and II., p. 121. — Morse, Shell-mound of Öniori, p. 58. — 



Syst. Conch. Cab., XI., 3, p. 63. 

 Synonym. — M. quadrangidaris Desh. 



Oji (frequent), Shinagawa (rare). 



Living: ( )mori (in Tokyo Bay), Kii, Higo, Nagasaki, 

 Kagoshima, Tschifu, North China. 



102. MA(TRA SULCATARIA Desh. 

 PI. II. Fios. 26 a and h. 



Lischke, Jap. ^leeres-Conch., I., ]i. 133. — Schrenpk, Moll. Amurl. and 

 Nord-Jap. Metres, p. 570. — Brauns, Geol. Env. Tokio, p. 28. 



Oji (ahundant), Shinagawa (rare). 



Living : Tokyo, Knoui-a (Suruga), Izumi, Köchi (Tosa), 

 Nagasaki, Kagoshima, Hakodate, North China, Possjet Bay, 

 Kurile Sea at the east coast of Sakhalin. 



