98 -Art. 1. — M. Yokoyama : 



anterior part uf the aperture. Outer lip thin and simple. Umbi- 

 licus closed. Height 4 millim. Diameter 2 millim. 



A. Adams describes a species found living at Awash i ma under 

 the name of Odostomia ovoidea (Ann. Mag. Nat. Hist., 1860 p. 

 416) which seems to resemble the present fossil in form. But he 

 says that the aperture is oblong and the fold small. 



Fossil occurrence. — Otake, Shisui, Kioroshi, Shito (rather 

 frequent). Oji in Musashi. 



140. Odostomia (Odosfotnia) fonennn, Yokoyama. 

 PI. IV. Fig. 31. 



Shell small, ovate-conic, rather solid. Post-nuclear whorls 

 iibout five, smooth, convex with sutures very distinct. Body- 

 whorl very large, a little higher than spire. Periphery rounded. 

 Base convex. Aperture ovate, acute behind, produced and 

 rounded in front. Oolumella-fold very strong, oblique, its 

 anterior elongation forming the inner peristome of the anterior 

 part of the aperture. Height 4 millim., of which the body-whorl 

 seen from the apertural side occupies 2.0 millim. Diameter 2 

 millim. 



In shape this species is like Odostomia culta Dall and Bartsch 

 {Notes on Pyraraidellid?e before quoted, p. 361, pi. XXVI, fig. 

 ■9), but it is shorter and has the whorls more convex. 



Fossil occurrence. — Otake, Tega (not rai'e). Oji in Musashi. 



141. Odostomia {Odostomia) suboasia, Yokoyama. 

 PI. IV. Fig. 32. 



A single specimen. 



Shell small, ovate-conic. Whorls few, post-nuclear four, 

 slightly convex, smooth. Sutures well marked. Body-whorl a 

 little shorter than two-thirds the height of the shell. Aperture 

 ■ovate, pointed behind, produced and "rounded in front. Fold 

 oblique, strong. Height 3 millim. Diameter 1.4 millim. 



This shell is extremely like Odostomia oxia Watson (Challenger 

 Oastr. , p. 484, pi. XXXI, fig. 4) from North-East Australia, and 



