Fossils from the Miura Peninsula and its [mmediate North. 35 



shoulders tubercuiated, above which the surface is somewhat 

 concave with fine spiral stria 1 and oblique lines of growth; on the 

 body-whorl the tubercles are less distinct with the surface below it 

 mostly smooth, the fine spiral grooves only appearing near thé 

 lower end. Aperture long and linear with the lower end some- 

 what truncate. 



The specimens are not rare, but all more or less water-worn, 

 on which account the tubercles are often indistinct, Fig. 15 

 shows a worn specimen, 17 millim. in height and 8 millim. in 

 diameter. Fig. 16. is a better preserved specimen, measuring 14 

 millim. by 7 millim. 



The related species are Conus d' Orbignyi Am. (Tryon, Conch., 

 vol. X, p. 75, pi. 23, fig. 90) from the Japanese and Chinese 

 waters and Conus antidiluvianus Broc. (Hörnes, Moll. Wiener- 

 Beckens, p. 138, pi. V, fig. 2) from the European Neogene, from 

 whieh, however, our fossil is readily distinguishable by its shorter 

 spire. 



Fossil occurrence. — Miyata Zone (Kami-Miyata) ; Koshiba 

 Zone (Koshiba). 



Family Pleurotomidae. 

 Genus PJeurototna, Lamarck. 



15. Pleurotoma kamakurana, Pilsbry. 

 Pl. I. Fig. 17. 



Pleurotoma ? lamalurana. Pilsbrt, Cat. Mar. Moll. Japan, p. 16, pl. II, figs. 15, 16. 



This shell is elongate-fusiform in shape, witli the canal nearly 

 as long as the spire; the whorls are very convex, almost angular, 

 concave above and appressed at the suture. The sculpture consists 

 of mimerons short vertical folds and numerous subequal crowded 

 spiral threads. The vertical folds on the body-whorl do not reach 

 the level of the upper angle of the shell-aperture, becoming 

 obsolete as they approach that level. The aperture is longly oval, 

 passing' below into a long, open, straight canal. Sinus wide and 

 shallow; outer lip gently arched forward. 



We possess two imperfect specimens, the larger of which is 12 



