498 PROCEEDINGS OF THE ACADEMY OP [AugUSt,. 



vex, the last rounded at the periphery, a little compressed above 

 and below. Aperture oblique, semicircular, the outer lip simple, 

 unexpanded, 7iot thickened. Umbilical callus whitish, rather large 

 and densely pitted. Alt. 2.2, diam. 3.3 mm. 



Yaeyama, in the southwestern group of the Loo Choo Islands 

 (Mr. Y. Hirase, >so. 624). Types No. 80,967 Coll. A. N. S. P. 



About half the dimensions of H. verecimcht of Okinawa, but 

 with tlie same number of whorls, and a simple, unexpanded lip. 

 I at first supposed the specimens were young, but the receipt of a 

 second lot from Mr. Hirase, agreeing in size and other characters 

 with the first, indicates that they are full grown. 



ZONITIDuE. 

 Microcystina Hiraseana n- sp. 



Shell trochiform, with minute, nearly covered perforation; 

 brown, glossy and smooth, slightly transparent. The periphery 

 has a narrow, acute, projecting keel, visible in the suture above. 

 Spire conic, the apex obtuse. Whorls 5^, quite convex ; base con- 

 vex, narrowly impressed in the centre. Aperture shaped like a 

 crescent with truncate ends, slightly oblique; peristome simple and 

 acute, the columellar margin reflexed at the perforation, thickened 

 within with a white callus, sometimes sinuous. Alt. 3, diam. 

 3.5 mm. 



Tane-gashima (Mr. Y. Hirase, No. 667). 



This species resembles 31. ceratodes (Gude) in general features, 

 but is more elevated, with more exserted keel, a less varnish-like 

 gloss, and more closely coiled whorls. 



MacrocWamys tanegashimae n. sp. 



Siiell small, depressed, minutely perforate, smooth and glossy, 

 rich brown, somewhat translucent. Spire low-conoidal, obtuse at 

 the apex. Whorls 4^, moderately convex, rather closely revolving, 

 appressed at the suture, which appears margined; the last whorl 

 nearly double the width of the preceding, rounded at the periphery, 

 moderately convex beneath. Aperture crescentic, slightly oblique, 

 the lip simple and thin, abruptly reflexed at the columellar inser- 

 tion. Alt. nearly 2, diam. 3.8 mm. 



Tane-ga-shima (Mr. Y. Hirase, No. 666). 



About the size and general appearance of the shell I called 

 Vitrea Iiariiaeusis, but which I subsequently decided to be young 



