1904.] NATURAL SCIENCES OF PHILADELPHIA. 623 



outer lip. Aperture subcircular. the peristome expanded, thickened; 

 baso-cohmiellar margin rounded. Cohunellar tooth small. Parietal 

 callous rather large. Palatal plica long, partially covered by the cal- 

 lous. 



Length 2.8, diam. 1.6 mm. 



Length 2.8, diam. 1.4 mm. 



Kumejima, Riukiu. Types No. 87,629, A. N. S. P., from No. 1,288 

 of Mr. Hirase's collection. 



Related to D. oshimcv, but the whole shell is ^yider and the back of 

 the last whorl is convex, not flattened and tapering as in that species. 

 Diplommatina kumejimana n. sp. 



The lower half of the shell is C3dindric, the upper half tapering in a 

 long cone; dull red; evenly, delicately striate. Whorls 7, convex, the 

 last whorl convex below, ascending in front. The constriction is at 

 the end of the penultimate whorl, close behind the upper insertion of 

 the peristome. The aperture is circular; peristome thickened and 

 reflexed. Columella arcuate, with a small columellar tooth. Parietal 

 callous approaching the suture above. Palatal plica moderately long, 

 wholly under the callous. 



Length 3, diam. 1.4 mm. 



Kumejima, Riukiu. Types No. 87,654, A. N. S. P., from No. 1,288a 

 of Mr. Hirase's collection. 



Related to D. oshimce, but the sculpture of the spire is finer, and the 

 constriction is behind the peristome, while in D. oshimce it is in front, 

 above the aperture. 

 Diplommatina lateralis n. sp. 



The upper half of the shell is long-conic, the lower half cylindric, 

 but the penultimate whorl is contracted on the right side. Dull 

 brownish-yellow, evenly, delicately striate. Whorls 7^ to 7f, convex, 

 the last well rounded, somewhat ascending in front. Constriction 

 lateral, on the penultimate whorl some distance behind the lip. Aper- 

 ture subcircular, the lip thickened, expanded and reflexed. Columella 

 bearing a quite small tooth. Parietal callous not extensive. The pala- 

 tal plica is concealed by the suture, from its recession following the 

 constriction. 



Length 3, diam. 1.6 mm. 



Miyakojima, Riukiu. Types No. 87,636, A. N. S. P., from No. 1,298 

 of Mr. Hirase's collection. 



This species is well distinguished b}^ the lateral constriction. 

 Diplommatina immersidens n. sp. 



Shell convexly tapering above the penultimate whorl, dull red, 

 evenly sculptured with delicate, not close rib-striiie. Whorls 7|, convex 



