Fossils from the Miura Peninsula and its Immediate North, 149 



is ornamented with fine, radial, unequal striae crossed by dense 

 concentric lines, thereby appearing somewhat scaly. The height 

 may have been about 24 millim., and the length about 20millim. 

 The depth is 6 millim. 



Fossil occurrence. — Naganuma, Zone (Naganuma); Upper 

 Musashino of Musashi, Kazusa and Shimosa. 



Living. — Northern and Central Japan; Philippines; New 

 South Wales; Panama; Bay of Caracas. 



190. Lima japonica, A. Adams. 

 Pl. XII. Fig. 9. 



Lima japonica. Reev*e, Conch. Icon., vol. XIII, pl. V, fig. 21. A. Adams, Proc. Zool. Soc. 

 10S3. p. 506. 



Lima off. jap mica. Tjkonaga, Foss. Env. Tokyo, p. 64, pl. HI, fig. 26 ab. 



Sowerby in Reeve's Conchologia Iconica describes this shell 

 as follows: 



,, Shell ovate, ventricose, broad, rather straight, nearly equi- 

 lateral, rayed with numerous strong, rather sharp ribs: ventral 

 margin scarcely obliquely produced; hinge margin broad; auricles 

 nearly equal: umbones produced." 



We possess two valves which we identify with Adams species. 

 The one is nearly perfect and larger, while the other is smaller 

 and lacks the umbonal portion. The former measures 16 millim. 

 in height, 10, 5 millim. in length and 5 millim. in depth. It is 

 thin and fragile, nearly elliptical in shape, almost equilateral and 

 with both ears nearly equal. The surface-ribs are numerous, about 

 twenty-six in number, straight, rather sharp and ridge-like toward 

 the ventral margin, crossed by dense lines of growth. They are 

 present all over the surface' except at the farthest ends near the 

 hinge-line. The ligamental pit is very broadly triangular and shal- 

 low. The smaller specimen measures 8 millim. in length and 

 shows a somewhat less number of ribs. 



Fossil occurrence. — Kanazawa Zone (Nojima); Koshiba Zone 

 (Koshiba); Upper Musashino of Musashi. 



Living. — Northern and Central Japan; New Zealand. 



