140 CONTRIBUTIONS 
Observations. This is a very distinct and beautiful 
species. Its large folds, together with the flatness of the 
superior part of the whorls, amply distinguish it. The 
only specimen I have seen is the one now described, and 
judging from the absence of folds on the first whorls and 
the sharpness of the outer lip, it may prove to be rather a 
young individual. 
C. sculptura. Plate 5. Fig. 137. 
Description. Shell subturrited, folded longitudinally 
and transversely set with numerous elevated lines; spire 
elevated, pointed ; whorls six, subangular at the top ; um- 
bilicus very small ; mouth subovate, columella with two 
indistinct folds; outer lip dentate within and furnished 
with a varix. 
Length .4, Breadth .2, of an inch. 
Observations. 1 have seen but one perfect specimen of 
this species. A second one has been despoiled of its varix. 
It is distinguished from the plicata, which it resembles, in 
the spire being more elevated, as well as in the folds being 
closer. The transverse lines cutting the folds, give it the 
appearance of being reticulated. Between the folds very 
minute longitudinal striz may be perceived under the lens. 
C. tessellata. Plate 5. Fig. 138. 
Description. Shell turrited, with longitudinal large ribs 
cut by transverse strie which are enlarged at the junc- 
tion; substance of the shell thin ; whorls , subangular, | 
