56 -^"t- 6. — M- Yokohama : • 



strongly swollen body-whorl and a large wide aperture. The 

 surface which is apparently smooth, when examined with a lens, 

 reveals very tine spiral stria? decussated by lines of growth. 



Schrenck considers Vohdlmr'pa ampullacea (Mi©.) as identical 

 with this species. But Middendorffs species is said to be deep 

 purple in colour, while Jay's is light-coloured (yellowish-ash), I 

 leave the question open. 



Fossil occurrence. — Miyata Zone (Shimo-Miyata); Upper 

 Musashino of Musashi, Kazusa and Shimosa. 



Living. — Central Japan (Tokyo Bay); Northern Japan (Hako- 

 date). 



Family Nassidae. 



Genus Nassa, Martini. 



47. Nassa (Hima) japonica, A. Adams. 



Pl. III. Fig. 5. 



Nassa japonica. A. Adams, Proc. Zool. Soc. London, 1851, p. 110. Lischke, Jap. Meeres- 

 conch., m, p. 37, pl. II, figs. 20 23. Brauns, Geol. Env. Tokio, p. 29. Tokünaga, Foss. Env. 

 Tokyo, p. 9. Non Xassa japonica Lischke in Jap. Meeresconch., I, p. 61 (= Nassa balteata 

 Lischke). Non Xassa japonica Reeve, Conch. Icon., Nassa, pl. 29, fig. 192 (= Desmonlea japonica 

 A. Adams). 



Caesia japonica. H. and A. Adams, Ann. Mag. Nat. Hist., 1870, vol. 5, p. 426. 



Xassa tenuis. Smith, Ann. Mag. Nat. Hist., 1875, p. 423 ; Proc. Zool. Soc. London, 1879, 

 p. 211. 



Lischke says of this species: 



" Turrete, thin-shelled, with nine whorls, of which about two 

 belong to the embryo; the others are strongly rounded and 

 separated from one another by deep sutures. The largest of our 

 specimens is 15 millim. long (of which 5 millim. fall on the 

 aperture) and 7,5 millim. broad. The sculpture consists of longi- 

 tudinal ribs and spiral threads; the former become generally indis- 

 tinct on the last whorl, but distinct again near the aperture, while 

 the latter are more sharply bounded, their number being four on 

 the first whorls, five on the penultimate and ten to eleven on the 

 ultimate. These threads run over the longitudinal ribs forming 

 more or less distinct tubercles at their points of intersection. The 

 interspaces are nearly as long and broad as the threads and 



