52 -^rt. ]. — M. Yokoyama: 



54. l^^ttsus eoreanieus, Smith. 



PI. II. Fig. 10. 



Fmus eoreanieus. Smith, Proc. Zool. Soc. London, 1879, p. 204, pi. XX, fig. 36. 



Pilsbry, Catalogue p. 27. 

 Ptychatractus eoreanieus. Tryon, Mau. Conch., Ill, p. 72, pi. 40, fig. 186. 



The three specimens wliich were collected all lack the apex. 

 The shell is fusiform with whorls convex in general, but flat or 

 slightly concave just below the sutures. The sculpture consists of 

 longitudinal ribs and spiral threads. Longitudinal ribs coarse, 

 rounded, slightly oblique, wider than interspaces, about twenty on 

 the penultimate whorls, generally indistinct on the body- whorl 

 and quite obsolete on its base; spiral threads many, close, unequal, 

 every third usually larger. Aperture uval. Canal short, bent 

 sideward as well as a little backward. Inner lip covered with a 

 smooth callus and devoid of plaits. Outer lip thin, crenulate at 

 margin, with distant transverse striae within corresponding in 

 position to larger threads without. 



Smith seems to have had a young shell. He gives the height 

 as 22 milhm, and the diameter as 8 millim. Among our specimens 

 there is one with the height about 30 millim. and the diameter 12 

 to 13 millim. 



Tr^'on in his Manual of Conchology brings this shell under the 

 genus Ptycl tat r actus. But as it has no columella-plaits, I deem it 

 more proper to let it remain under Fusus. 



Fossil occurrence. — Otake, Shisui, Shito. ' Rather rare at all 

 places. 



Living. — Western Japan. 



55. Fusus niponicus, Smith. 



PI. II. Pig. 11. 



Fusus niponieus. Smith, Proc. Zool. Soc. London, 1879, p. 203, pi. XX, fig. 12. 

 Sowerby, Thes. Conch., IV, Fusus, p. 79, pi. 411 (7), fig. 70. Pilsbry, Catalogue, 

 p. 26. Tryon, Man. Conch., Ill, p. 65, pi. 39, fig. 169. Yokoyama, Foss. Miura 

 Penin., p. 49, pi. II, fig. 7. 



Fusus subohlitus. Pilsbry, New Jap. Mar. Moll., Gastr., Proc. Acad. Nat. Sei., Philad.,. 

 1904, p. 18, pi. I, fig. 5. 



