Fossils from the Minra Peninsula and its Immediate North. Si' 



the periphery, there are still two coarser threads between which 

 there are one to three finer ones. Base convex, with mort; than 

 ten spiral stria? between which there is an interstitial stria most 

 distinct near the umbilicus which is small and deep. Lines of 

 growth distinct, especially on the base. Aperture squarish (outer 

 lip somewhat fractured). Height 4 millim., diameter milium 

 The only specimen present is coloured pinkish with blotches of a 

 deeper purple. 



This species is easily distinguished from the preceding ones 

 by bicarinated periphery. 



Fossil occurrence. — Yokosuka Zone (Yokosuka). 



Genus Cantharidus^ Montfort. 



98. Cantharidus japonicus, (A. Adams). 



Pl. V. Fig. '26. 



Cantharidus japonicus. Pilsbry, Cat. Mar. Moll. Jap., p. 95. 

 Ziziphinus japonicus. A. Adams, Proc. Zool. Soc. Lond., 1851, p. 167. 

 Trochus hilaris. Lischke, Jap. Meeresconch., II, p. 85, pl. V, figs. 14, 15. 

 Calliostoma hilaris. Ptlsbry in Trton's Man. Conch., XI. p. 355, pl. 17, fig. 25. 



The shell is small, high-conical, imperforate; whorls about 

 six, almost flat with very little convexity, separated by sub- 

 canaliculated sutures, smooth with usually two, rarely three, 

 impressed spiral lines near the lower suture which may be in- 

 distinct, or even wholly obsolete. Periphery angulated. Base 

 convex with several spiral stria?. Aperture subquadrate. Height 

 8 millim., diameter 6 millim. 



Living specimens of this species shine with a yellowish to 

 greenish hue on the surface and iridescent green inside the aper- 

 ture. The traces of the external colour are partly preserved in 

 our fossils. 



Not frequent. 



Fossil occurrence. — Miyata Zone (Mukaibatake in Shimo- 

 Miyata); Yokosuka Zone (Yokosuka and Otsu). 



Living. — Central and Western Japan. 



