CYLICHNA. 



umbilicated, slightly mamillate. Whorls 4, convoluted, sutures little 

 impressed ; base moderately effuse ; lip thin, rather produced in the 

 middle, broadly arcuate in front, a little sinuous behind, scarcely 

 channelled ; toward the suture quite rounded. Inner lip distinct, 

 somewhat calloused behind ; columella with quite a marked fold,, 

 the axis revolving around the base. Alt. -11, diam. '055 inch, 

 angle of divergence 180. (Qor.). 



San Diego, California* 



Cylichna planata CPR., Journ. de Conch. 1865, p. 139 ; Moll. 

 Western N. A., p. 133,307. 



C. PROPINQUA Smith. Unfigured. 



Shell elongated, cylindrical, a little contracted in the middle, 

 white, covered with a pale brown epidermis, browner above and 

 below ; transversely very finely undulately striated. Vertex ex- 

 cavated, narrowly perforated in the middle, surrounded by an acute 

 margin. Aperture narrow above, dilated below, lip nearly parallel 

 with the whorl ; columella spirally twisted. 



Alt. 13, diam. 5 mill. (5m.). 



Vaneouvers Island. 



C.propinqua SM., Ann. Mag. N. H. (4), ix, p. 351, 1872. 



This species in general aspect reminds one of the common C. 

 arachis Q & G. ; but it is considerably narrower, with the vertex 

 only excavated with a minute perforation, not umbilicated, and the 

 basal margin of the aperture is roundly truncate. (/S'm.). 



C. ATTONSA Cpr. 



Cylichna (cylindracea var. /) attonsa CPR., Moll. W. N. A. pp. 23, 

 89, 133, 169. 



An undescribed form from the Vancouver district. 



Specie* of Japan and China. 



C. SEMISULCATA Dunker. PI. 26, figs. 78, 79, 80. 



Shell cylindrical, rather solid, rounded at both ends, white, 

 covered with a pale brown epidermis; delicately and densely lon- 

 gitudinally rugate, transversely sulcate at the base; lip acute, some- 

 what straightened ; aperture as usual, dilated in front ; columella 

 rimate. Alt. 18, diam. 8 mill. (Dkr.). 



Japan ; exact locality unknown. 



