50 Art 6.— M. Yokôyaina: 



shining; the others are moderately eonvex and longitudinally 

 plicated, with plicaa about fifteen in number on the penultimate 

 and obsolete on the body- whorl. There are also distant spiral 

 threads, about six on the penultimate and many on the ultimate 

 whorl, which on crossing the plicœ elevate into compressed trans- 

 versely elongated tubercles. The interspaces between threads are 

 filled up by finer spiral threads or stria: 1 . Aperture rhombic, 

 passing below into a long canal somewhat curved backward. 

 Outer lip is thin and broken in our specimen, but it is said to be 

 crenate within according to Sowerby. 



Fossil occurrence. — Miyata Zone (Maruyama-no-Saka in 

 Shimo-Miyata); Koshiba Zone (Koshiba). Upper Musashino of 

 Kazusa. 



Living. — Central Japan. 



3(5. Fusus perplexus, A. Ada.ms. 

 Pl. II. Fig. 17. 



Fusus perplexus. A. Adams. Jour. Linn. Soc, 1864, VII, p. 106. Pii.sbry, Cat. Mar. Moll. 

 Japan, p. 26. Tokunaga, Foss. Env. Tokyo, p. 6, pl. I, fig. 6. 



Fusus inconstant*. Lischkf, Jap. Meeres Conch., I, p. 34, pl. II, figs. 1-6, IT, p. 26, pl. Ill, 

 figs. 1-5. Brauns, Geol. Env. Tokio, p. 55. 



Three imperfect specimens which, however, can easily be 

 recognized by the longitudinal plicae and unequal spiral threads. 

 The living representative of this species is very common on the 

 coast of Central Japan. 



Fossil occurrence. — Naganuma Zone (Naganuma); Upper 

 Musashino of Musashi, Kazusa and Shimosa. 



Living. — Northern, Central and Western Japan. 



Family Buccinidae. 



Genus Chrysodonws, Swainsox. 



37. Chrysodomus phoeniceus, Dall. 

 Pl. II. Figs. 8, 9, 10. 



Chrysodomus ph ulcus-. Dall, Proc. U. S. Nat. Mus., vol. XIV, 1891, p. 187, vol. XVII, 

 1895, p. 708, pl. XXIX, fig. 1. 



The shell is ovately fusiform and rather solid; the whorls 

 number about six with the uppermost two embryonal and smooth; 



