714 PROCEEDINGS OF THE ACADEMY OF [Oct., 



glossy and spirally striate surface, the sculpture of the two species 

 being quite different. 



Trochomorpha cultrata iheyaensis n. subsp. 



Shell much larger than cultrata, of a very pale brownish-buff tint, 

 granulation excessively minute; umbilical keel strong. 



Alt. 8.7, diam. 24.3 mm. ; diam. umbilicus (measured from its bound- 

 ing keel) 9.7 mm. Wliorls 7. 



Iheyajima, Ryukyu. Types No. 89,932, A. N. S. Phila., from No. 

 631c of Mr. Hirase's collection. 

 Trochomorpha cultrata oshimana n. subsp. 



Shell smaller than cultrata, chestnut brown, not perceptibly granu- 

 lose; strongly angular around the umbilicus but not keeled. Whorls 

 more numerous, 7 or 7^, slightly projecting above the sutures, the last 

 acutely carinate. 



Alt. 5.2, diam. 15 mm. ; diam. of umbilicus (measured from the bound- 

 ing angle) 5.6 mm. 



Oshima, Osumi. Types No. 89,936, A. N. S. Phila., from No. 1,334 

 of Mr. Hirase's collection. 



Ten specimens of this very distinct race were taken. 

 Macrochlamys kumeensis n. sp. 



Shell perforate, depressed, thin, brown, somewhat glossy, weakly 

 striatulate, without spiral striae. Spire low conoidal. Whorls 5, con- 

 vex, slowly increasing, the last much wider, rounded peripherally, con- 

 vex beneath, impressed around the axis. Aperture slightly oblique, 

 lunate; columella oblique, strengthened with a slight callus inside. 



Alt. 3.8, diam. 6 mm. 



Kumejima, Ryukyu. Types No. 90,250, A. N. S. Phila., from No. 

 1,357 of Mr. Hirase's collection. 



Only six specimens of this species were taken. It is a compact lit- 

 tle snail, with low growth-wrinkles but no spiral striae. 

 Microcystina acuta n. sp. 



Shell low-conic, resembling M. ceratodes in general shape; minutely 

 perforate, thin, brownish-yellow, very glossy, sculptured with low 

 growth-wrinkles only. Spire convexly conic with obtuse apex. Whorls 

 5^,' convex, slowly increasing, parted by an impressed suture, very 

 narrowly margined above. Last whorl acutely carinate, the keel nar- 

 row, becoming weaker on the latter part of the whorl. Base convex. 

 Aperture lunate, the columella thickened with a white callus, abruptly 

 dilated at the insertion, half covering the perforation. 



Alt. 4.6, diam. 6 mm. 



