Fossils from the Upper Musashino of Kazusa and .Shimosa. 1 45 



A large and splendid species easily recognized by its double 

 lunula, one within the other. There are two valves, a right 

 and a left. The former is 83.3milhm. long, 82.3minim. hio-h 

 and lo.Tmillim. deep, while the latter is 74.1 millim. long, 

 72.Gmillim. high and 14. 2 millim. deep. 



Fossil occurrence. — Otake. 



Living. — Central Japan. 



Genus Vyclina, Deshayes. 

 227. Vycliita ehinensis, (Chemnitz). 



CijcUna chinensis. Desliayes, Traité Elément., I^ pt. 2, p. 626, pi. 14, fi"s. 20-22. 



Pfeiffer in Syst. Conch. Cab., XI, pt. 1, p. Ill, pi. II, fig, 5, pi. XXVIII, fig. 1. 



Lischke, Jap. Meeresconcb., I, p. 126. Brauns, Geol. Env. Tokio, p. 53. 



Tokunaga, Foss Env. Tokyo, p. 48. Yokoyama, Foss. Miura Penin., p. 119, pi. 



XI, figs, 7, 8. 

 Venus chinensis. Chemnitz, Conch. Cab., X, p. 356, pi. 171, fig. 1663. 



Only two right valves. 



Fossil occurrence. — Otake, Tega. Tabata in Musashi. Lower 

 Musashino of Yokosuka. 



Living. — Northern, Central and Western Japan. China Sea. 

 Cochin China. 



Genus Lueitiopsis, Forbes et Hanley. 



228. Luciàiopsis divarieata, Lischke. 



PI. X. Fig. 7. 



Lucinopsis divariata. Lischke, Jap. Meeresconcb., Ill, p. 90, pi. VII, figs. 12-14. 



A single left valve. It is rather thin, tolerably inflated, 

 circular in general outline and nearly equilateral. Of the three 

 main teeth, the middle one is very thick and bifid. The surface- 

 sculpture has been obliterated by friction. Palliai sinus deep, 

 ascending, triangular. Length 11.5 millim. Height 10.9 millim. 

 Depth 3.3 millim. 



Fossil occurrence. — Shito. 



Living. — Central and Western Japan. 



