590 PROCEEDINGS OF THE ACADEMY OF [DcC, 



The last whorl ascends moderately to the lip, and is usually worn nearly 

 smooth. The palatal plica is short, and either wholly to the left of 

 the parietal callus, or its inner half may be under the callus. The 

 aperture is rounded, a little longer than wide. Peristome thin, rather 

 narrowly reflexed, sometimes very indistinctly subangular at the 

 base of the columella. The parietal callus spreads rather extensively 

 upward, and has a thin, raised edge. The columellar tooth is so deeply 

 immersed that it is not visible in a front view. 



Length 3, diam. 1.8 mm. 



Suwanosejima, Osumi. Types No. 95668 A. N. S. P., from No. 

 1587 of Mr. Hirase's collection. Also found on the adjacent islands 

 Akusekijima and Nakanoshima, of the Tokara group. 



This species is related to D. saginata of Oshima and D. tanegashimce 

 of Tanegashima, both of them much smaller species. D. tanegashimce 

 is also more slender. D. saginata is a common and characteristic 

 species of Oshima. It is very similar toD. nesiotica but always much 

 smaller, so far as present collections show. 



Specimens from Akusekijima and Nakanoshima are a trifle smaller 

 than the types from the intermediate island Suwanosejima, measuring 

 2.5 to 2.8 mm. long. The palatal phca is slightly longer, and in some 

 specimens the columellar tooth is visible in a front view. 

 Diplommatina hirasei Pilsbry n. sp. 



The shell is large for a Sinica; the last two whorls, form more than 

 half the total length, are cylindric, upper portion conic with straight 

 sides. Whorls fully 6^, moderately convex, the last strongly ascending 

 in front, having a very strong, narrow ridge or collar a short distance 

 behind the lip, the back of the collar opaque whitish. Constriction 

 very slight, median in front. Color dull red. Sculpture of very 

 delicate hair-like striae, closer and finer on the last two whorls than on 

 the preceding two, and usually worn from fully adult shells. The 

 aperture is circular, orange colored within; peristome reflexed and 

 somewhat thickened, continued in a raised ledge across the parietal 

 wall, reaching to or almost to the suture. Palatal plica rather long and 

 wholly covered by the parietal callus. Columellar tooth strong, the 

 lamella within moderately high but thin. Internal parietal lamella 

 low. 



Length 4.75, diam. 2.5 mm. 



Gakuenji, Izumo. Types No. 95670 A. N. S. P., from No. 1596 of 

 Mr. Hirase's collection. Also Makuragisan, Izumo, No. 95669 A. N. 

 S. P. 



This largest of the Japanese Diplommatinas is in every way more 



