Fossils from the Miura PensuTa and its Immediate Sorth. 185 



length and shows a longitudinal median depression which becomes 

 nearly flat near the anterior end. The ventral valve is deeper 

 than the dorsal one and shows a strong longitudinal rounded keel. 

 The original orange-red colour is preserved as a light yellowish- 

 brown tint. 



Fossil occurrence. — Miyata Zone (Harashita in Shimo-Miyata 

 (rig. 25) and Kami-Miyata (tig. 28). Upper Musashino of Kazusa. 



Living. — Northern, Central and Western Japan. 



236. Terebratella pulvinata, (Gould). 

 Pl. XIX. Fig. 26. 



TerebrateUa pulvinata. Davidson, Eec. Brach., p. 90, pl. XVI, fig. 15. Carpenter, Check- 

 List West Coast X. American Shells, 1860. Dali, Amer. Journ. Conch., vol. VI, p. 117. 

 Terebratula (Waldheimi <) pulvinata. Gould, Otia Conch., pp. 97 and 255. 



A somewhat broken specimen, 14 millim. long, 13,5 millim. 

 broad and 7 millim. thick. It is rather orbicular, widest posteri- 

 orly and tapering anteriorly, with lateral and front margins rounded. 

 The convexity of the dorsal and ventral valves is nearly equal and 

 regular. The beak is small, with a round foramen bounded below 

 by a deltitium. The surface, when examine! with a lens, is tessel- 

 lated with numerous hue, elongated dots arranged more or less 

 in a quincunx, a character which Gould also observed in his speci- 

 mens. The whole shell still shows a pale yellowish tint which 

 may be due to its having been originally coloured by a similar hue. 



Fossil occurrence. — Miyata Zone (Harashita in Shimo-Miyata). 

 Upper Musashino of Kazusa. 



Living. — Puget Sound, Washington. 



238. Terebratella nipponensis, Yokoyama. 

 Pl. XIX. Fig. 27. 



Terelratella nipponensis. Yokoyama, Brach.fr. Xeog. of Koshiba, Jour. Geol. Soc. Tokyo, 

 vol. XVII, no. 201, p. 3, pl. v, figs. 13-16. 



A single specimen. 



Shell small, tumid, somewhat squarely oblong, longer than 

 wide, lateral margins only slightly rounded and nearly parallel, 



