CYLICHNA. 303 



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. "OSo inch, 

 angle of divergence 180°. {Cpr.). 



San Diego, California, 



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

 WesternN. A., p. 138,307. 



C. PROPINQUA Smith. Unfir/ured. 



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. (<S/n.). 



Vancouvers 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. {Sm.). 



C. ATTONSA Cpr. 



Cylichna (cylindracea var. ?) uttonsa Cpr., Moll. AV. N. A. pp. 23, 

 89, 133, 169. 



An undescribed form from the Vancouver district. 



Speciefi of Japan and China. 



C. SEMisuLCATA Duuker. PI. 26, figs. 78, 79, 80. 



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

 covered w-ith 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. {Dh:). 



Japan; exact locality unknown. 



