632 PROCEEDINGS OF THE ACADEMY OF [Sept., 



Europe. The latter, however, is a slightly larger species with strongly 

 striate surface, while insulivaga is smooth. The palatal plica also 

 differentiates the snail of Yoronjima from its European relative. 



ZONITIDJE. 

 Trochomorpha cultrata n. sp. 



Shell openly umbilicate, much depressed, the spire low-conic, base 

 convex; light reddish-brown, rather thin. Surface slightly shining, 

 very minutely striate, the lower surface most minutely decussate with 

 spiral striae. Whorls 6f, the first two convex, the rest convex below 

 the suture, concave above the following suture. Last whorl very 

 acutely carinate, concave above and below the keel, distinctly angular 

 around the conic umbilicus. Aperture small, oblique, rhombic, with 

 thin, unexpanded peristome. 



Alt. 7, diam. 20 mm. 



Tokunoshima, Osumi. Types No. 87,502, A. N. S. P., from No. 

 631a of Mr. Hirase's collection. 



This species is much more depressed than T. gouldiana, with much 

 more widely open umbilicus. T. horiomphala Pfr. is a still more 

 depressed species, with a distinct keel around the umbilicus. 



Trochomorpha cultrata esuritor n. var. 



Similar to T. cultrata, but decidedly smaller, and somewhat less 

 depressed. 



Alt. 6, diam. 16.5 mm., whorls 6^. 



Okino-Akimejima, Osumi. Types No. 87,518, A. N. S. P., from No. 

 1,246 of Mr. Hirase's collection. 

 Sitala insignia n. sp. 



Shell imperforate, trochiform, thin and fragile, pale yellowish. Sur- 

 face minutely striate spirally, and with rather coarse, low wrinkles of 

 growth. Whorls nearly 3, the first 1J very convex, the rest flatly 

 sloping, the last whorl acutely carinate, base convex. Aperture large, 

 very oblique, angular at the position of the keel, the peristome thin and 

 simple. 



Alt. 1, diam. 1.7 mm. 



Irazuyama, Tosa. Types No. 87,530, A. N. S. P., from No. 1,179 of 

 Mr. Hirase's collection. 



This is a remarkable species, not like any other Japanese or Indian 

 Sitala known to us. Though very small, it seems to be mature, and 

 could not be the young of any known species of the region. 

 Sitala latissima oonica n. subsp. 



Similar to S. latissima, but paler and more elevated. 



Yoronjima, Osumi. Types No. 87,573, A. N. S. P., from No. 9536 of 

 Mr. Hirase's collection. 



