1901. J NATURAL SCIENCES OF PHILADELPHIA. 351 



the expansion; continued in an adnate callus across the parietal 

 wall. Palatal fold short, to the left of the parietal callus. 



Length 2.2, diam. 0.9 mm. 



Oshima (Mr. Y. Hirase, No. 648). 



This species is not related to any other form known from Japan 

 or the Loo Choo group. The turreted shape, extremely convex 

 whorls, and regular spaced rib-strife are its prominent features. 



Diplommatina saginata n. sp. 



Shell dextral, imperforate, shortly oblong-conic, obese, amber- 

 colored or white, densely sculptured with delicate thread-like rib- 

 strise, about 25 in the space of a millimeter on the penultimate 

 whorl, slightly wider apart on the earlier whorls; no spiral stria- 

 tion. Penultimate whorl widest, those above forming a regularly 

 conic spire. Whorls 6^-, the first obtuse and smooth; last whorl 

 much smaller than the penultimate, strongly ascending in front. 

 Aperture subcircular; colurnellar tooth strong, as usual. Peris- 

 tome narrowly reflexed, thickened on the face, continuous in a 

 delicate cord across the parietal margin. Palatal fold above the 

 columella, rather long. 



Length 2.3, diarn. 1.2 mm. 



Nase, Oshima (Mr. Y. Hirase, No. 6496) ; also Furuniga, 

 Oshima (No. 649a). 



A smaller, shorter species than D. insularum of Kunchan, 

 Okinawa, or D. cassa of Hondo. In one specimen the outer lip 

 is duplicate, in the others merely thickened. The upper margin of 

 the peristome rises nearly to the preceding suture. A specimen 

 from Furuniya measures, length 2.24, diam. 1.28 mm. 



Diplommatina oshimae n. sp. 



Shell dextral, imperforate, bright red -amber colored, the penulti- 

 mate whorl widest, those above regularly tapering, forming a long, 

 attenuated spire. Whorls 7, convex, the first two or three dark 

 red, smooth, the next two having conspicuous thread-like, wide- 

 spaced riblets, the last two whorls densely sculptured with low, more 

 delicate rib-strise; the last whorl somewhat contracted, ascending 

 in front, gibbous on the base behind the columellar lip. Aperture 

 circular, the peristome reflexed, not doubled, its inner edge a little 

 thickened and built forward, scarcely continuous, the parietal callus 



