slightly effuse anteriorly ; lip rather wide, not very sharp, reflected 

 nearly into the plane of the aperture- 

 Length .94 inch ; breadth .3 inch. 



In Jan. 1845 I described C. olesa, and as its variety C. densestriata. 

 The former differs from C. hrevls Pfr. invariably, in the multitude of 

 individuals which I have seen, in having the raised lines comparatively 

 very distant. It is limited to a small district, on both sides of which 

 C. brevis is widely distributed. If not a good species, it may retain 

 the name, C. obesa, as a variety. But C. densestriata is specifically 

 identical with C. brevis, yet it is not an inappropriate name for a very 

 shining variety in which the strire are excessively fine. 



Cthndrella columna is perhaps a variety of C brevis Pfr. 

 But the spire has rectilinear and almost exactly parallel outlines in 

 its lo\^■er two-thirds or three-fourths ; the shell is longer ; the whorls 

 are wholly flattened ; the lip is more widely spread ; and the strisB 

 are as small as in the more finely striated varieties of C. brevis. 



Length .72 inch; breadth .22 inch; of another, length 575 inch; 

 breadth ,18 inch. 



Variety iNTER:\rEDiA more resembles C- brevis in having the 

 whorls a little convex ; but the shell is longer than the type of C co- 

 lumna, and the aperture a little larger. 



Length .78 inch ; breadth .22 inch. 



C. rosea, Ad. Proc. Bost. Soc.Nat. Hist. Feb. 18, 1846, received 

 the name of C. carnea in my printed catalogue of shells Jan. 1, 

 1847. 



C. carnea var. cerina differs from the type chiefly in its wax col- 

 or and in being a little more slender. 



Cylindrella inornata. Shell subovate or fusiform, but elonga- 

 ted ; whitish ; with fine oblique arcuate sharp prominent but not very 

 closely set raised lines, anteriorly with two carinas which are not prom- 

 inent ; spire with the outlines moderately convex in the middle and 



lower whorls ; apex truncate with the loss of whorls ; eight or 



nine whorls remaining, quite convex, with a deep suture ; last whorl 

 well detached and produced ; aperture subangular on the right side, 

 in the rest rounded; lip a little thickened, narrow, moderately re- 

 flected. 



Length .38 inch ; breadth .11 inch. 



Cylindrella simplex. Shell subovate, or fusiform, moderately 

 elongated ; whitish ; with very oblique straight faint straie, with one 

 joaoderately sharp carina at the anterior extremity, and another which 



