Fossils from the Miura Peninsula and its. Immediate North. 1 K\ 



The antero-dorsal margin is somewhat excavated, wliile other 

 margins are more or less rounded. The surface is ornamented 

 with numerous, straight, round, radiating ribs separated by inter- 

 vals of less breath. The number of ribs is about thirty-seven at 

 the periphery, being replaced by a few striae on the posterior ear 

 and on the lunula which is deep and short-lanceolate in form. 

 Concentric lines of growth conspicuous, especially toward the ven- 

 tral margin where the concentric grooves give the ribs a subscaly 

 appearance. Area moderate in size, having the form of an inequi- 

 lateral triangle, the anterior side being the shortest. Ligamental 

 pit triangular, deep and with the apical angle acute. Inner mar- 

 gin crenate. 



This species has a general outline of Lima squamosa Lam. 

 (=Lima lima L.) but is thinner, more tumid and has a greater 

 number of ribs, in which last respect it is not unlike Lima multi- 

 costata Sow., a species which is flatter. 



A few specimens; the perfect one, a right valve, is represen- 

 ted in our figure. It is 22 millim. high, 18 millim. long and 6 

 millim. deep. 



Fossil occurrence. — Koshiba Zone (Koshiba). Upper Mu- 

 sashinu of Kazusa. ' 



Living. — A worn specimen strongly resembling this fossil 

 species has been obtained near the coast of Awa (Central Japan). 



Family Pectinidœ. 



Genus JPecten, Belon. 



193. Pecten squamatus, (Gmelin). 



Pl. XIV, Fig. 3, 4. 



Pecten squamatus. Sowerby, Thes. Conch., I, Pecten p. 70, pl. Ill, fig 57, 58. Reeve, Conch. 

 Icon., vol. VIII, sp. 82. Dunker Index Moll. Mar Jap., p. 240, pl, XI, fig, 14. Küster in Syst. 

 Conch., Cab., VII, pt. II, Spondylus un I Pecten, p. 113, pl. XXXII, fig. 4. Yoshiwaba, Ninon 

 San Kairui Zusetu, Pectinidae, Zool. Mag. Tokyo, Vol. XIV, p. 208, pl. Ill, fig. 8. Lischke, Jap. 

 Meersconchyl., II, p. 173. 



Ostrea squamata. Gmelin, Syst. Nat. ed. 13, p. 3329. 



One left and two right valves, the former lacking the beak- 

 portion and the latter especially the anterior ear. They are very 



