82 Art. 6.— M. Yokoyarna: 



86. Odostomia (Parthenina) takinogawensis, Tokunaga 

 Pl. V. Fig. 10. 



Odo tomia takinogawensis. Tokunaga, Foss. Env. Tokyo, p. 23, pl. I, tig. 45. 



Shell small, elongate-ovate, turrete; whorls six, of which two 

 are nuclear and smooth, the others slightly convex, perpendicular, 

 shouldered with shoulders angular and surface above them flat and 

 slightly sloping, longitudinally plicated; plicœ about fifteen on 

 the penultimate whorl, straight, more or less sharp and roof-like, 

 separated by interspaces of nearly equal breadth, reaching from 

 the upper to the lower suture, weaker and finer on the body-whorl, 

 becoming obsolete in its last portion. Periphery rounded. Base 

 convex with continuations of weak longitudinal plicae and very 

 finely transversely striated (only seen with a magnifying glass). 

 Aperture ovate, with the posterior corner pointed. Outer lip 

 sharp, dentate within. Columella with a strong fold. Height 

 5 millim. Diameter 2 millim. Two specimens. 



Fossil occurrence. — Naganuma Zone (Naganuma); Upper 

 Mu>ashino of Musashi (rare). 



87. Odostomia (Odostomia) sublimpida, Yokoyama. 

 Pl. V. Fig. 13. 



Shell very small, elongate-conic. Whorls six, flatly convex, 

 separated by deep sutures, smooth. Body-whorl feebly angulate 

 at the periphery. Aperture large, ovate, rounded in front, acute 

 behind. Outer. lip thin. Columella with a sharp lamellar fold. 



There are two specimens apparently belonging to one and the 

 same species. The one is from Naganuma, which, though larger, 

 has only the last three whorls preserved. The other is from 

 Okine, which, though smaller lias the shell perfect. The latter 

 measures 3 millim. in height and 1,5 millim. in diameter. 



The species is very much like Odostomia lirn/pida Dall and 

 Bartsch (Notes on Jap., Indopac. , and Amer. Pyramide Llidre, 

 Proc. U. S. Nat. Mus., vol, XXX, p. 364, pl. 26, fig. 7) also from 

 Japan. But the fossil form, so far as the only perfect specimen 

 from Okine goes, is decidedly shorter with the sutures deeper and 

 the aperture wider. 



