Fossils from tho Miura Peninsula and its [înmediate ÎTorth. ] J7 



called Tellina {Macoma) nasuta of the Upper Musashino of the 

 neighbourhood of Tokyo all belong to the present species. Kare. 



Fossil occurrence. — Miyata Zone (Shimo-Miyata); Yokosuka 

 Zone (Otsu); Upper Musashino of Oji. Tabata and Shinagawa. 



Living. — Central Japan. 



143. Macoma inquinata, (Deshayes). 

 Pl. VIII. Figs. 1, 2. 



Macoma inquinata. Pilsbry, Cat. Mar. Moll. Jap., p. 124. Arnold, Pal. a. Strat. Mar. 

 Plioc. a. Pleist. San Pedro, p. 162, pl. XVI; fig. 4. 



Tellina inquinata. Deshayes, Proc. Zool. Soc. London, 1854, p. 357. Römer in Syst. 

 Conch. Cab., vol. X, pl. 4. p. 227, pl. 44, fig. 1-4. Dunker, Index. Moll., p. 190. 



Tellina inquinata var. incongrua. Lischke, Jap. Meeresconch., II, p. 117, pl. X, figs. 12, 13. 



Tellina incongrua. Martens, Ann. Mag. Nat. Hist, series III, vol. 16, p. 430. Römer in 

 Syst. Conch. Cab., X, pl. 4, p. 225, pl. 43, figs. 11-13. 



This species is distinguished from the preceding by the 

 higher and more swollen form and the ventral margin more quick- 

 ly ascending to the posterior end. 



We possess only a few examples, of which a right valve 

 measuring 31 millim. in length 25 millim. in height and 7 millim. 

 in depth is the largest. 



Fossil occurrence in Japan: — Miyata Zone (Nagai) and Yoko- 

 suka Zone (Otsu). Upper Musashino of Shimosa. 



Fossil occurrence in foreign countries: — Pliocene and Pleisto- 

 cene of California. 



Living: — Northern, Central and Western Japan. Okhotsk 

 Sea. West Coast of America from Alaska to San Diego. 



Macoma nipponica, (Tokunaga). 

 Pl. VIII. Figs. 3, 4. 



Tellina nipponica. Tokunaga, Foss. Env. Tokyo, p. 44, pl. II, figs. 36a, 36a'. 



Shell transversely oblong, rather thin, somewhat swollen, 

 strongly inequilateral, the anterior side being about one and a 

 half times as long as the posterior. Anterior end rounded, 

 posterior obtusely angulate with a shallow notch below it. 

 Antero-and postero-dorsal margins sloping, the former le>s steeply 



