1908.] NATURAL SCIENCES OF PHILADELPHIA. 589 



8 whorls, the first 5^ convex, regiilarl}'- and slowly increasing ; the next 

 enlarges more rapidly and is the widest, most convex whorl. It 

 contracts suddenly to the constriction, which lies one-fourth of a whorl 

 back of the peristome. The front of the last whorl has very widely 

 spaced strise when unworn, but the last half is smooth and glossy. 

 It ascends very little. The palatal pUca is short. It is faintly visible 

 above the suture in the thinnest shells, but most adults are too opaque 

 to show it externally. The aperture is subcircular, somewhat obhque. 

 Parietal callus thin, its edge scarcely thickened, ascending about half 

 way to the suture. Columellar lamella thin and small, its spiral con- 

 tinuation inward being thin and rather low. 



Length 3.1, diam. 1.4 mm. 



Yonakunijima, Osumi. Types No. 95675 A. N. S. P., from No. 1510 

 of Mr. Hirase's collection. 



In this species the last fourth of the penultimate whorl, in front of 

 the constriction, is very narrow. It is related to D. kumejimana 

 P. and H., but differs by its far more widely spaced riblets. 



Diplommatina okiensis tsushimana n. subsp. 



The shell is like D. collarifera S. and B. in shape, but differs as 

 follows: The delicate thread-like strise of the last two whorls are 

 more widely spaced, and on the next earlier two whorls they are still 

 more spaced. The palatal plica is very short and lies under the 

 parietal callus. The spiral columellar lamella within the last whorl is 

 thin and much lower than in collarifera. D. okiensis is very similar, 

 but tsushimana differs by having the strise more widely spaced through- 

 out. The shell is pale brown, and resembles okiensis in the aperture 

 and collar. 



Length 3.9, diam. 1.9 mm.; whorls 6^. 



Tsutsu, Tsushima. Types No. 95664 A. N. S. P., from No. 1554 of 

 Mr. Hirase's collection. 



Diplommatina nesiotica n. sp. 



A species of the subgenus Sinica. The lower two whorls form a 

 cylindric portion, those above taper rapidly in a straight-sided cone 

 about one-third the total length of the shell. It is pale red or grayish- 

 white, with sculpture of very dehcate hair-hke strise, which are rather 

 closely placed on the last two whorls, more spaced on the two preceding. 

 Whorls slightly exceeding 6, quite convex, regularly and slowly widen- 

 ing to the penultimate, which enlarges rapidly and is more swollen. 

 It contracts rather strongly to the constriction, which varies in position 

 from submedian in front to nearly over the inner edge of the columella. 

 38 



