1901.] NATURAL SCIENCES OF PHILADELPHIA. 421 



sculptured with close, regular and rather fine rib-strise, coarser on 

 the last whorl. Aperture vertical, rhombic-piriform, the peris- 

 tome white, reflexed, somewhat thickened, the outer lip excavated 

 above to form an indistinct sinulus; the upper margin to the right 

 of the superior lamella is cut into 3 to 5 entering folds, deeply crenu- 

 lating the lip-edge; the rest of the right margin is weakly and irregu- 

 larly subcrenulate. Superior lamella strong, slightly oblique, attain- 

 ing the margin, continuous with the long and high spiral lamella. 

 Inferior lamella strong, approaching the superior, not reaching 

 upon the lip, very heavy and callous below, strongly spiral and 

 with a superposed callus within. Subcolumellar lamella emerging. 

 Principal plica rather long and strong, visible within the aperture, 

 extending inward slightly beyond the latero- ventral lunella. 

 Upper palatal plica small and low, united with the lunella. Lower 

 palatal plica short and high 3 angularly elevated and overhanging 

 downward in the middle, where the strong lunella joins it. 



Clausilium (PI. XXIII, figs. 26-29) well curved, wide above, 

 the lower half tapering, narrow, terminating in a blunt apex, 

 which is channeled and spout-like outside. Columellar margin 

 thickened near and at the apex; palatal margin sinuous, bearing 

 a sharp, high, keel-like thickening on the outside along its lower 

 half; proximal end emarginate on the columellar side of the fila- 

 ment. 



Length 32, diam. 7, longest axis of aperture 7.8 mm. 



Length 30, diam. 7.3, longest axis of aperture 8.3 mm. 



Length 26, diam. 6. 3, longest axis of aperture 7 mm. 



Kunchan, Okinawa (Mr. Y. Hirase, No. 632a). 

 1 ' This species differs from C. callistochila in the weak crenulation 

 of the right lip, shorter principal plica, shorter and differently 

 shaped lower palatal plica, the smaller upper palatal, which is 

 united with the lunella, and especially in the different form of the 

 clausilium. 



^ Specimens No. 632 b of Mr. Hirase' s collection, also from Kun- 

 chan, the northern province of Okinawa, are green from adhering 

 algse, evidently having lived in a moist place. The crenulation of 

 the lip is much less marked, there being but one or two inter- 

 lamellar folds close to the superior lamella; the lower palatal fold 

 and lunella are shortened, forming a sort of triangular buttressed 

 pyramid; the lunella is very low above, and curves into a sub- 



