1901.] NATURAL SCIENCES OF PHILADELPHIA. 345 



the margin of the umbilicus abrupt but not keeled. Aperture small, 

 rhombic, the peristome simple, obtuse and whitish in fully adult 

 specimens. Alt. 5.3, diam. 12.7 mm 



Oshima (Mr. Y. Hirase, No. 650). 



This species differs widely from T. cathcartce (Rve. ) and T. hori- 

 ompfiala (Pfr. ), the two species known from the Loo Choo group, 

 in its higher spire and less spreading form. It is closely related 

 to T. Shermani (Pfr.) of Formosa, but differs in being smaller, 

 with straightly conic spire, the whorls concave above keel and 

 suture, and the aperture narrower, less rounded below. 



It is named in honor of Dr. A. A. Gould, who described the 

 Japanese shells collected by the Ringgold and Rogers Expedition. 



I find two specimens in the collection of the Academy, labeled 



II H. horiomphala Pfr. Oosima." 



Macro chlamys perfragilis n. sp. 



Shell perforate, depressed, excessively thin, transparent, pale 

 yellow, fragile. Surface brilliantly glossy, with faint growth-lines 

 and almost obsolete, scarcely perceptible spiral striae. Spire low- 

 conic. Whorls 4J, somewhat convex, rather slowly widening, 

 separated by a narrowly margined suture, the last whorl much 

 wider, rounded at the periphery, rather convex beneath, narrowly 

 impressed around the perforation. Aperture very broadly lunale, 

 somewhat oblique, the lip fragile, columellar margin with a short, 

 triangular reflection partially concealing the perforation. 



Alt. 10, greater diam. 18, lesser 15 mm. 



Alt. 8, greater diam. 16, lesser 14^ mm. 



Kunchan, Okinawa (Mr. Y. Hirase, No. 637). 



A capacious, very fragile species, somewhat like M. Stearnsi Pils. 

 of China, and quite different from anything yet described from 

 Japan or the Loo Choo group. 



Macrochlamys Gudei n. sp. 



Shell minutely perforate, depressed-conoidal, thin, somewhat 

 translucent, corneous-brown. Surface glossy, sculptured with 

 weak growth-wrinkles, and on the base some coarse but shallow 

 and inconspicuous spiral sulci, obsolete in places. Spire conic; 

 whorls 6f , rather strongly convex, slowly widening, the last wider, 

 subangular at the periphery, the angle obvious in front, but dis- 

 appearing near the aperture. Base convex, sunken around the 



