150 Art - 6.— M. Yokoyama : 



19]. Lima subauriculata, (Montagu). 

 Pl. XII. Fig. 10. 



Lima auriculata. Weinkauff, Conch, d. Mittelmeers, vol. II, p. 245. no. 7. Forbes and 

 Hanley, Hist, of Brit. Moll., vol. II, p. 263, pl. LIII, fig. 4, 5. Reeve, Coach, Icon., vol. XVIII, 

 Lima, pl. V, fig. 22. Wood, Crag Moll. pt. II, Bivalves, p. 47. pl. VII, fig. 3. Homes, Foss. 

 Moll. Tertiär-Beckens von Wien, II, p. 389, pl. LIV, fig. 6. Nyst, Conch. Terr. Tert. Belgique, 

 p. 158, pl. XII, fig. 3. 



Lima sulcata. Möller, Ind. Moll. Groenl., p. 18. 



Lima sulculus. Loven, index Moll. Scandin., p. 32, no. 2 244. 



Lima nivca. Philippi, Enurn. Moll. Sic, ;pt. I, p. -78 no. 3. Nyst, Rech, sur les Coq. Foss. 

 Prov, d'Anvers, p. 17, no. 69. 



Pecten subauriculatus. Montagu, Test. Brit., suppl., p. 65, pl. XXIX, fig. 2. 



Two valves, one of which is broken. The perfect one is very 

 small, 6 millim. high, 4 millim. long and 2 millim. deep, thin, 

 fragile, oblong, tumid, equilateral and furnished with two equal 

 ears. The surface is covered with straight, radiating, rather sharp 

 riblets which are distinct only in the middle portion of the shell, and 

 faint or obsolete on both sides. Their number is about sixteen. 

 An interspace found in the middle of the shell is more conspicu- 

 ous than others and probably corresponds to what Reeve designates 

 as a median sulcus. Lines of growth numerous, distinct, giving a 

 striated or granulated appearance to the riblets. Ligamental pit 

 broadly triangular, with the apical angle slightly greater than a 

 right angle. 



This species is closely related to the preceding, but is smaller 

 and lacks the riblets on the sides. 



Fossil occurrence in Japan. — Miyata Zone (Shimo-Miyata and 

 Kami-Miyata). Upper Musashino of Musashi, Shimosa and 

 Kazusa. 



Fossil occurrence in foreign countries. — Crag of England, 

 Pliocene of Belgium and Italy, Miocene of France, Hungary, 

 Austria, etc. 



Living. — Mediterranean; Canaries; British Islands; Norway; 

 Greenland. 



192. Lima quantoensis, Yokoyama. 

 • Pl. XII. Fig. 11. 



Shell rather small, thin but firm, moderately convex, ob- 

 liquely ovate, inequilateral, closed, with anterior auricle very small. 



