92 CYCLOSTBEMA. 



C. BIFORCATA, A. Ad. PL 32, figs. 56, 57. 



Rather narrowly umbilicated, orbicularly depressed, last whorl 

 with two sharp keels of which the lower is most prominent, aperture 

 rather rounded, outer lip two-lobed. Diam. 2*5 mill. 



Seto-Uchi, Japan. 



('. L.I:VIS, Kiener. PI. 32, fig. 55, 59, 60. 



Widely umbilicated, depressed, smooth, last whorl encircled by 

 a Amber of rather distant keels, one of which forms an angular 

 periphery, umbilicus with a flat wall, defined by a rib. 



Diam. 15 mill. 



Port Lincoln, Australia; Japan; Viti Is. 



It is 0. diatreta, Gould, and Delphinula nivea, Reeve. The latter 

 attributes his species to Chemnitz, who in this, as in many other 

 instances was not binomial. C. lactea, Jouss, (figs. 79, 60), a species 

 described as differing from Icevis in the regularity of its keels, also 

 appears to belong here, for the keels are very irregularly developed 

 in number, prominence ana spacing; it was described from a single 

 specimen, without locality. 



C. DUPLICATA, Lischke. PL 32, fig. 58. 



Moderately umbilicated, rather solid, striate, carinate at the suture, 

 bicarinate at the periphery, with two less developed carinse on the 

 base, circumscribing the flat-walled umbilicus; periphery thickened. 



Diam. 4 mill. Japan. 



C. VIRGINIA, Jousseaume. PL 32, figs. 61, 62. 



Widely umbilicated, thick, solid, opaque, white, with about eleven 

 rounded spiral ribs on the last whorl, the intervening grooves longi- 

 tudinally striate, the strise more prominent around the umbilicus, 

 whorls 4J, rapidly enlarging, convex; peristome thickened. 



Diam. 6 mill. Madagascar? 



Has more ribs than C. cingulifera, A. Ad. 



( '. ANGULATA, A. Adams, PL 32, figs. 63, 64, 65. 



Widely umbilicated, periphery keeled, with spiral lirre above it, 

 base with a submedian keel, defining the umbilicus, and producing 

 the basal margin of the peristome. Diam. 12 mill. 



Isl. Zebu, Philippines; Guadeloupe, St. Martin, W. Indies. 



( '. (tiif/ulata, A. Ad. was described as from the Philippines on the 

 authority of Cuming, but as that great collector sometimes made 



