Fossils from the Upper Musashino of Kazusa and Sliimosa. 141 



217. Tellhiti ojiensis, Tokunaga. 



Tellina ojiensis. Tokiuiaga, Foss. Env. Tokyo, p. 44, pi. II, fig. 34. Yokoyama, Foss. 

 Miura Penin., p. 113, pL VII, figs. 16, 17. 



A right and a left valve. The former measures 16 millim. in 

 length, n.ÖmiUim. in height and 3 millim. in depth, the latter 

 10.5 millim. in length, 7.6 millim. in height and 1.5 millim. in 

 depth. 



Fossil occurrence.— Otake. Oji in Musashi. Lower Musa- 

 shino of Miyata. 



Living- — Northern and Central Japan. 



21 s . Tellinn tniyatetisis, Yokoyama. 

 Tellina miyatemis. Yokoyama, Foss. Miura Penin., p. 115, pL VII, fig. 18. 



This small transversely elongated shell already descrihed by 

 me from the Lower Musashino is widely distributed in the Upper. 



Fossil occurrence. — Otake (very mumerous), Kioroshi, 

 Kamenari, Tega, Shito. Oji in Musashi. Lower Musashino of 

 Miyata. 



219. Tellina delta, Yokoyama. 



PI. X. Pigs. 8-10. 



Shell small, rather thick, ovately and obliquely trigonal, 

 moderately convex, nearly equivalve, strongly inequilateral with 

 posterior side twice as long as anterior, rounded at both ends 

 though more sharply in front than behind. Antero-and 

 postero-dorsal margins nearly straight, meeting at an angle of 

 about 110° at the beak; ventral margin broadly arcuate. Surface 

 uniformly convex and furnished with close, regular, concentric 

 furrows. Cardinal teeth two in each valve, the anterior in the 

 left and the posterior in the right being larger. Lateral teeth two, 

 one on each side of the cardinal ones. Palliai sinus large, with 

 the upper border obliquely ascending and terminating near the 

 anterior muscular impression with a blunt end. 



The shell does not attain more than Smihim. in length, 6.5 

 milhm. in height and 3.2 millim. in thickness. 



