1908.] NATURAL SCIENCES OF PHILADELPHIA. 593 



angle disappearing immediately behind the peristome. The whorl 

 scarcely descends in front, not angular around the umbiHcus. The 

 aperture is rounded-lunate; peristome thin, forming three-fourths of 

 a circle; the upper margin is slightly expanded, outer and basal mar- 

 gins reflexed. Parietal callus merely a thin film. 



Alt. 8.5, diam. 13.7 mm. 

 " 9, " 13 



Izuhara, Tsushima. Cotypes No. 95859 A. N. S. P., from No. 1551 

 of Mr. Hirase's collection. 



This is a strongly angvilar species of the E. aperta group. The 

 peristome is like that of E. aperta tumida. Neither E. aperta or E. 

 mimula is known from the island of Kyushu. 

 Trishoplita cretacea hypozona n. subsp. 



The shell is conic, white with a broad purplish-brown or rich reddish- 

 brown zone on the base. The surface is rather finely striate, the striae 

 elegantly granulose, especially on the base. 



Alt. 14, diam. 17.8 mm.; whorls 6^. 

 " 12, " 16.8 " '' 6. 



Mikuriya, Hoki. Types No. 95862 A. N. S. P., from No. 387a of 

 Mr. Hirase's collection. It also occurs at Mihonoseki and Gakuenji, 

 Izumo, and at Itsukushima, Aki. 



The shell is generally in large part denuded of cuticle, as in T. 

 cretacea. The granules on the strise of the base are irregular, not 

 arranged in spiral lines. Some specimens from Izumo are smaller: 



Alt. 12.2, diam. 16 mm.; whorls 6^. 

 '' 10, " 14.5 '' " 6. 



A single example seen from the province Aki resembles hypozona 

 in shape and color, but differs in minute sculpture, the strise being 

 superficially cut by fine spiral lines, chiefly evident on the base, in 

 place of the irregular granulation of typical hypozona. This form 

 (No. 87678 A. N. S. P., No. 1190 of Mr. Hirase's collection) may be 

 found separable from hypozona, yet we prefer to refer it to that race 

 until more material can be brought together. 



T. c. hypozona inhabits the provinces along the northern shore of 

 the western end of the main island of Japan. 

 Ganesella albida mollioula n. subsp. 



The shell is larger than G. albida, thinner, more transparent, bluish- 

 milky above the keel, transparent yellowish below, sculptured quite dis- 

 tinctly with close microscopic spiral lines; base decidedly more convex 

 than in albida, the mouth and columella being longer; whorls more 

 numerous. 



