588 PROCEEDINGS OF THE ACADEMY OF [DeC, 



Alycaeus laevis n. sp. 



A ChamalyccBus resembling A. tokunoshimanus in general form; 

 openly umbilicate; spire low, conoiclal, the first whorl projecting. 

 Whorls 3^, regularly increasing to the middle of the last whorl, where 

 it rapidly enlarges, becoming much inflated. The inflation is termi- 

 nated by a moderately contracted neck which curves down to the 

 aperture. There is a prominent swelling around the neck in the 

 middle. The "tube" is rather long and pressed into the suture. 

 The surface is smooth, lightly marked with growth-lines, but on the 

 inflation there are distinct fine and close strise. The neck is smooth 

 and glossy. The aperture is very oblique; peristome expanded, 

 usually dilated to form a short lobe at the posterior angle. In fully 

 mature individuals an inner rim is built out shortly beyond the expan- 

 sion. Alt. 3, diam. 4 mm. 



Nakanoshima (Osumi). Types No. 95831 A. N. S. P., from No. 

 1514 of Mr. Hirase's collection. It occurs also on Suwanosejima. 



In having a smooth surface, marked with sHght growth-lines only, 

 becoming striate on the inflation, this species is very distinct from 

 other Japanese and Ryukyuan forms. The rounded swelling on the 

 neck is a further distinguishing character. 

 Diplommatina paxillus ultima n. subsp. 



The shell is somewhat more robust than D. paxillus from Shanghai 

 or Cheju, Quelpart. The peristome is less angular at the foot of the 

 columella, — only very indistinctly so. The peristome is doubled, or 

 there is a wrinkle or two behind the outer lip. Adults vary from 

 reddish-brown to nearly white. 



Kashitake, Tsushima. Types No. 95662 A. N. S. P., from No. 1554a 

 of Mr. Hirase's collection. Also taken at Kojeto (Island of Koje), 

 Korea, No. 95660 A. N. S. P., from No. 1531 of Mr. Hirase's collection. 



D. paxillus (Gredler) is a very widely distributed species, ranging 

 from Hunan to the Korean Archipelago, with closely related forms 

 in Formosa and Tsushima. In the present state of our collections 

 it is not easy to define subspecies. A form from Mokpo, Korea (No. 

 1531a of Mr. Hirase's collection), is similar to the shells from Koje 

 Island, except that there is a distinct angle at the foot of the columella. 

 The form from Quelpart is very close to typical Chinese D. paxillus. 

 Diplommatina yonakunijimana n. sp. 



The shell is narrow, the penultimate whorl much the largest, those 

 above tapering in a rather long cone with straight sides; pale brown; 

 sculpture of delicate thread-like striae, wanting in the region of the 

 constriction and on the last half or more of the last whorl. There are 



