Fossil occurrence. — Otake (very common), Kioroshi, Kame- 

 nari, Tega (frequent). 



Living. — Central Japan (Sea of Sagami). 



Genus MACO^TIA, Leach. 



220. Macoiiin praefeaefa, (Martens). 



PI. X. Figs. 2, 3. 



Tellina pnietexta. Martens, Auu. Mag. Nat. Hist., XVI, p. 430. Lischke, Jap. 

 Mecresconcb., vol. I, p. 180, vol. II, p. 113, p]. X, fig. 14. Dunker, Ind. Moll., 

 p. 190. Pilsbry, Cat., p. 125. 



This shell somewhat resembling Tellina nitidula Dkr. in 

 shape as well as in its thin state is more triangular with the ventral 

 margin more ascending behind, so that the end appears somewhat 

 rostrate. The posterior fold is also more distinct than in Dunker' s 

 species. The lateral teeth are wholly wanting. The posterior 

 main tooth of the right valve is thick and bifid. 



The largest specimen obtained is 31 millim. in length, 20.5 

 millim. in height and 7.6 millim. in thickness. 



Fossil occurrence. — Otake, Shisui, Tega, Shito (rather rare at 

 all these localities). Dokwanyama in Musashi. 



Living. — Central and Western Japan. 



221. Macottia nippoiiica, (Tokunaga). \ 



Macoma nippohica. Yokoyama, Foss. Miura Penin., p. 117, pi. VIII, figs. 3, 4. 

 Tellina nipptonica. Tokunaga, Foss. Env. Tokyo, p. 44, pi. II, fig. 36. 



A full description of this species is given in my work above 

 quoted. 



Fossil occurrence. — Otake (not rare), Tega, Kamenari, Shisui, 

 Sliito (very common). Oji and Tabata in Musashi. 



Living. — Northern Japan. 



222. Maconui iuQuinattt, (Deshayes). 



Macoma inqiiinata. Pilsbry, Cat., p. 124. Arnold, Pal. Strat. Mar. Plioc. Pleistoc. 

 San Pedro, p. 162, pi. XVI, fig. 4. Yokoyama, Foss. Miura Penia., p. 117, pi. 



