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. I 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 striae may be perceived under the lens. 



C. tessellata. Plate 5. Fig. 138. 



Description. Shell turrited, with longitudinal large ribs 

 cut by transverse strirc which are enlarged at the junc 

 tion ; substance of the shell thin ; whorls , subangular, 



