]]0, Art. 6 — M. Ynkoyama: 



in the middle which 'is directed a little obliquely to the posterior 

 side, and considerably widens towards the ventral margin. The 

 inner surface of the shell shows a broad, somewhat elevated rib 

 corresponding to the external groove and also many radiating 

 lines, a few of which behind the rib are very marked and rib-like. 

 Palliai sinus large, deep and rounded. 



There are many specimens which, however, owing to the thin 

 and brittle state of the shell are mostly broken. The largest and 

 best preserved one is a left valve, 44,5 millim. in length, 20,5 

 millim. in height and about 7 millim. in depth. 



A living shell which we possess for comparison is unfortu- 

 nately waterworn and bleached, but the original colour seems to 

 have been yellowish, and a part of the epidermis still attached tu 

 the shell is dark green in colour. 



Fossil occurrence. — Naganuma Zone (Naganuma). 



Living. — Central Japan (Coast of Awa or Böshu); Hong- 

 Kong. 



136. Solecurtus divaricatus, (Lischke). 

 Pl. VII. Fig. 14. 



Solecurtus divaricatus. Gi.essin in Syst. Conch. Cab. Mart. u. Chemn., vol. XI, pt. 3, Sol- 

 enacea, p. 87, pl. 21, fig. 4. 



Macha divaricata. Lischke, Jap. Meeresconch., I, p. 142, pl. X, figs. 1,2. Ddnkkb, Index 

 Moll., p. 175, pl. Vn, fig. 26. Tokunaga, Foss. Env. Tokyo, p, 36, pl. II. fig. 20. 



A single fragment of the posterior end of the right valve 

 which, on comparison with the living specimens, leaves no doubt 

 of its being the above mentioned species. 



Fossil occurrence. — Yokosuka Zone (Otsu); Upper Musashino 

 of yhimosa, Kazusa and Musashi. 



Living. — Central and Western Japan. 



Family Tellinidae. 



Genus Tellina. Linne. 



137. Tellina nitidula, Dunker. 



Pi. VII. Fig, 15. 



Tellina nitidida. Dunkef, Moll. Jap., p. 27.. pl. Ill, fig. 14. Lischke, Jap. Meeresconch.. 

 I, p. 129, H, p. 113, pl. X, figs. 10, 11. Brauns, Geo!. Env. Tokio, p. 39, Tokunaga, Fobs. Envir. 

 Tokyo, p. 42, pl. U, fig. 30. abc. 



