Fossils iïoin the Maura IVninsula and its Immediate North. 93 



In our specimen, the granulöse cinguli of the base are 

 alternately coarse and tine, and about twelve in all. The aper- 

 ture is subquadrate. 



Fossil occurrence. — Miyäta Zone (Mukaibatake in Shimo- 

 Miyata). Upper Musashino of Kazusa and Musashi. 



Living. — Northern, Central and Western Japan. 



Genus Calliosfoitta, Swainson. 



104. Calliostoma cipangoanum, Yokoyama. 



Pl. V. Fig. 23. 



Shell small, conical, imperforate; whorls about five, slightly 

 convex, spirally ribbed; ribs three with somewhat broader inter- 

 spaces, the uppermost one close to the suture and beaded; on the 

 body- whorl there is a fourth rib which is smooth and forms the 

 keeled periphery; a tine interstitial line is present in each inter- 

 space except the lowest. Base rather flat with many close 

 unequal spiral threads. Incremental lines indistinct except on 

 the base. Aperture trapezoidal. Columella smooth. Height 3,5 

 millim., diameter 3,5 millim. 



A single example. It resembles Calliostoma occidentalis 

 Miguels et Adams (Pilsbry in Try ox 1 s Man. Conch. XI, p. 393, 

 pl. 37, figs. 2, 3) from North Atlantic and the English Crag, but 

 the periphery is decidedly more angular. 



Fossil occurrence. — Yokosuka Zone (Yokosuka). 



105. Calliostoma sagamianum, Yokotama. 



Pl. VI. Fig. 1. 



Shell conical, imperforate, rather solid; whorls nearly flat 

 with two elevated, granose spiral ridges dividing the surface into 

 three unequal parts, of winch the middle i-; the broadest and the 

 lower the narrowest; these interspaces nre ornamented with 

 several unequal beaded strias whose number varies between two 

 and six according to the breadth of the interspace. Periphery 

 carinated, smooth. Base flattened, with many close unequal 

 smooth spiral stria?. Aperture trapezoidal. 



