QQ Art, 6.— M. Yofcoyama : 



Height 16 mill im. ; diameter 7 miliim. Slender form: Height J4 

 millim. ; diameter 5 miliim. 



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

 Shimo-Miyata); Yokosuka Zone (Yokosuka). Upper Musashino 

 of Kazusa. 



Living. — Japan (according to Dunker). 



Family Muricidae. 



Genus Trophon, Montfort. 



52. Trophon subclavatus, Yokoyama. 



Pl. III. Fig. 2, Pl. VI. Figs. 13, 14. 



Several specimens. 



Shell angulate-fusiform ; spire elevated; whorls about seven, 

 shouldered, with shoulders angular, ornamented with several 

 ridge-like varices numbering eight to ten on the body-whorl and 

 elevating into short spines at the shoulders. Canal long, slightly 

 bent. The largest specimen measures 34 miliim. in height and 

 14 miliim. in diameter. 



Compared with the already known forms of Trophon, our 

 fossil agrees most with the shell figured by Tryon (vol. II, pl. 31, 

 lig. 326) as Trophon elavatvs Sars from Norway with this difference 

 that it grows larger and the canal is a little bent instead of being 

 quite straight, 



Fusus candelabrum. Ad. et Rve (Tryon, vol. II, pl. 31, fig. 

 317), Trophon gunner i Loven Harmer, Plioc. Moll. Grt, Brit,, I, 

 pl. XII, fig. 26) and Trophon gracilis Arnold (Pal. a. Stratigr. 

 Mar. Plioc. a. Pleistoc. of San Pedro, California, pl. V, fig. 8) are 

 also closely related forms, though less slender than the Japanese 

 shell. 



The specimen shown in tig. 2, pl. Ill is a young shell, while 

 those shown in figs. 13 and 14, pl. VI, are older. Fig. 13 has 

 the low T er part of the outer lip slightly broken. 



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

 mo-Miyata). Upper Musashino of Kazusa. 



