1908.] NATURAL SCIENCES OF PHILADELPHIA. 587 



its face thickened and convex, the outer edge somewhat recurved. 

 It is appressed for a short distance to the preceding whorl. The 

 rather wide umbiHcus is eUiptical. 



Alt. 3, diam. 5.8 mm. 



The operculum is somewhat concave externally, and its whorls 

 bear elevated cuticular appendages or raised cord-like spirals, wanting 

 in the depressed central part, which is generally filled with dirt. 



Tsutsu, Tsushima. Types No. 95737 A. N. S. P., from No. 1553 

 of Mr. Hirase's collection. 



This is larger than other known Japanese species, with a more 

 broadly expanded peristome. It is related to the Korean A. cyclo- 

 phoroides Pils. and Hir., but differs by having a distinct swelling in 

 the middle of the neck and in some minor details of sculpture and 

 shape. By the characters of the operculum it belongs to the subgenus 

 Metalycceus. 



In a race of the same species found at Sasuna, Tsushima, the shell 

 is smaller, the diameter varying from 4 to 5 mm. This small form is 

 No. 95738 A. N. S. P., No. 1553a of Mr. Hirase's collection. 

 Alycaeus tokunoshimanus principialis n. subsp. 



The shell is much larger than A. tokunoshimanus, more or less deeply 

 reddish-yellow tinted above, nearly white beneath, the embryonic 

 whorls golden. Whorls 3^, the last half of the last whorl very much 

 inflated, then contracted into a rather small neck, beyond which the 

 whorl is strongly deflexed. Very closely and finely thread -striate, 

 more closely so on the inflated portion. Neck strongly bent downward. 

 Peristome strongly reflexed, thickened and bevelled on the face; 

 columellar border much narrower, its outer edge more or less straight- 

 ened. Alt. 3.3, diam. 5 mm. 



Ogachi, Oshima (Osumi). Types No. 95830 A. N. S. P., from No. 

 13306 of Mr. Hirase's collection. 



This is the finest development of the tokunoshimanus series. That 

 species was originally described from the smallest of the several forms 

 now known. 

 Alycaeus tokunoshimanus mediocrii n. subsp. 



The shell is decidedly larger than A. tokunoshimanus, with the neck 

 bent downward more, and more coarsely striate in front of the con- 

 traction. The sculpture of the neck is also coarser than A. t. prin- 

 cipialis. Alt. 2.9, diam. 4.5 mm. 



Yorojima (Osumi). Types No. 89926 A. N. S. P., from No. 1330 

 of Mr. Hirase's collection. Also found on Ikejijima (No. 89927 A. N. 

 S. P., and 1330a coll. Hirase). 



