Fossils from the Upper Musashino of Kazusa and Shiuiosa. 139' 



somewhat upward, making an obtuse angle with tlie steeply des- 

 cending, broadly curved posterior margin. The sculpture consists of 

 fine incremental lines and some still finer radiating ones which 

 can only be distinguished with a magnifier. The hinge has two 

 cardinal teeth in each valve and two laterals in the right. Of the 

 cardinal teeth, the posterior one in the right valve and the 

 anterior in the left are strong, directed upward and split, while the 

 other is oblique, narrow and simple. The lateral teeth are thin 

 and distant from the beaks. The palliai sinus is verj' large, 

 almost reaching the anterior muscular impression, its lower border 

 coinciding with the mantle-line for its whole length " 



The fossil specimens agree quite well with this, Lischke's 

 species. 



Fossil occurrence. — Otake (rare), Tega. (rather frequent). 

 Oji in Musashi. 



Living. — Central and Western Japan. 



214. Tellina venttlosa, Schrenck. 

 PI. X. Fi^. 1. 



Tellina venulom. öcbreuck, Moll. Amurl. u. d. uordjap. Meeres, p. 556, pi. XX, figs, 

 2-5. Danker, Ind. Moll., p. 192. Pilsbry, Cat., p. 124. 



A moderately thick, compressed, broadly triangular shell with 

 the length a little more than one and a half times the height. 

 The posterior lateral teeth are absent, while the anterior is single. 



The largest specimen attains the length of 100.5 millim. 



Fossil occurrence. — ( )take (frequent). Kioroshi, Tega, Shito- 

 (frequent). 



Living. — Northern Japan. Sea of Okhotsk. 



^l."». Tellina iiifi*1itla, Dunker. 

 PI. vni. Fi^-. 11. 



Tellina nitiditla. Danker, Moll. Jap., p. 27. pi. Ill, tig. 14. Lisclike, Jap. Meeres- 

 coucb., I, p. 129, II, p. 113, pi. X, figs. 10, 11. Branns, Geol. Env. Tokio, p. 39. 

 Tokunaga, Foss. Env. Tokyo, p. 42, pi. II. figs. 30 abc. Yokoyama, Foss. Miura 

 Peniu., p. 112, pb VII, fig. 15. 



