Fossils from the Miura Peninsula and its Immediate North. 79 



81. Scalaria (Acrira) densicostata, Yokoyama. 

 Pl. V. Fig. 14. 



Scalaria immaeulata, Tokunaga Foss. En v. Tokyo. 19, pl. I. fig. 35. Not Sc. immaculata. 

 Sow. 



Shell small, thin, turrete, whorls about nine, contiguous, 

 very convex, longitudinally ribbed and spirally finely striated: 

 ribs rather thick, not much elevated, obtuse, straight, numerous 

 (about twenty-five on the penultimate whorl), with equal or, as 

 is more usual, broader interspaces. Body-whorl somewhat keeled 

 at periphery, below which the ribs are obsolete and substituted by 

 coarse, unequal longitudinal lines. Aperture oval, angulated 

 behind, rounded and slightly curved out in front. Outer 

 lip thin. 



There are only two examples; the one has only three lower 

 whorls preserved and measures 7,5 millim in diameter, while the. 

 other which is smaller but more complete is about 15 millim. in 

 height and 5 millim. in diameter. 



Tokunaga described this species from the Upper Musashino of 

 Oji under the name of Scalaria immaculata Sow. (Thes. Conch., 

 I, Scalaria, p. 93, pl. XXXIII, fig, 58) which lives in Central 

 Japan, but the Sowerby species has very thin ribs which disap- 

 pear about the middle of the whorls and is quite a different form. 



Fossil occurrence. — Koshiba Zone (Koshiba); Upper Musa- 

 shino of Musashi. 



Family Bulimidae. 



Genus 1 Intima, Risso. 



82. Eulima (Leiostraca) yokoskensis, Yokoyama. 



Pl. V. Fig. 7. 



Shell very small, subulate, with spire somewhat curved, 

 smooth, polished, white and shining; whorls about nine, slightly 

 convex. Aperture ovate, pointed behind and rounded in front. 

 Inner lip a little reflexed outward; Outer lip thin and sharp. 

 Height 5 millim. Diameter 1,5 millim. 



