106 Art. 1.— M. Yokoyania : 



A slender shell with flat whorls (post-nuclear thirteen) orna- 

 mented with three spiral grooves. vSutures channelled. The 

 largest specimen measures nearly 8 millim. in height and 2 millim. 

 in diameter. Not rare. 



Fossil occurrence. — Otake, Shisui. 



Living. — Western Japan. 



155. Turbonilla {dtreliopsis ?) obsettra, Yokoyama. 



PI. V. Fig. 15. 



A single specimen. 



Shell small, elongate-conic. Nuclear whorls standing on edge 

 at the summit. Post-nuclear whorls six, convex, very finely 

 spirally striate, the stride crossing the growth-lines and giving the 

 surface a reticulate appearance which, however, can only he seen 

 with a strong lens. Body-whorl comparatively large, ahout one- 

 fifth the shell-height. Periphery rounded. Aperture ovate, 

 produced and rounded in front. Inner lip descrihing a broad 

 curve. Outer lip fractured. Height 5 millim. Diameter 1.5' 

 millim. 



Fossil occurrence. — Shito. 



156. Tttrbonillti (Careliopsis ?) tttif/ulifera., Yokoyama. 



PI. V. Fig. 16. 



Shell small, elongate-conic. Whorls about ten, of which one 

 and a half are nuclear and smooth. Post-nuclear whorls angulate 

 in the middle, the angle becoming gradually obtuse as the whorls 

 grow^ on the penultimate and ultimate whorls almost obsolete, 

 so that they look quite convex. Spirally striate; stride about ten, 

 close, separated only by fine impressed lines. Periphery angulate. 

 Base flatly convex, smooth. Aperture subquadrate, the inner lip 

 being bent at an angle a little greater than a right angle. Outer 

 lip thin. Height 6 millim. Diameter 1.8 millim. Only tw^o 

 specimens, one of which lacks the body-whorl. 



Fossil occurrence. — Shito. 



