Fossils from the Miura Peninsula md its Immediate North. 55 



fuscolineata, the shell is more ventricose and the spire shorter. 

 Compared with SiphonaUa spadicea, to some forms of which it 

 shows a great resemblance, it differs by having the outer lip 

 thickened and transversely ribbed within. SiphonaUa trochuhts 

 is more ventricose with all the whorls" generally longitudinally 

 plicate. 



One of the specimens at hand is somewhat more swollen than 

 others, and the plicae are very obscure also on the upper whorls 

 («g- 4). 



Fossil occurrence. — Naganuma Zone (Naganuma). 



Living. — Japan (Pilsbry). 



Genus Ituccinutn. Linne. 



45. Buccinum leucostoma, Lischke. 



Pl. II. Fig. 11. 



Buccinum leucostoma. Lischke, Jap. Meeresconeh., vol. Ill, p. 38, pl. I, tigs. 7, 8. Pilsbry.. 

 Oat. Mar. Moll. Japan, p. 32. 



Two badly preserved, imperfect specimens which, however, 

 are readil} T recognizable as Lischke' s species by their ovately 

 conical shape with very convex rounded whorls ornamented by 

 numerous, unequal spiral threads. The larger specimen measures 

 18 millim. in diameter, with both apex and canal broken. It 

 may have been about 38 millim. in height. 



Fossil occurrence. — Kanazawa Zone (Nojima). 



Living. — Central Japan. 



Genus I nlutharpa. Fischer. 



46. Volutharpa perryi, Jay. 



Pl. III. Fig. 12. 



Volutharpa pemji. Dunker, Index Moll. Mar. Japon., p. 33. Pilsbry, Cat. Mar. Moll. 

 Japan, p. 32. Tryon, Man. Conch., Ill, p. 200, pl. 79, fig. 38 ». Tokunaga, Foss. En v. Tokyo, 

 p. 8, pl. I, fig. 11. 



IhiUia pei-Tji. Jay, Beport on Shells coll. by Japan, Exped. under Command of Comm. 

 Perry. 1856, p. 295, pl. V, figs. 13-15. 



! Tritonium (Volutharpa) ampullaceum. Schkenck, Moll. Amurl. u. d. nordjap. Meeres, p. 347. 



Two small specimens, one of which is a mere fragment. This 

 is a very characteristic species with a thin shell, a short spire, a 



