TO GEOLOGY. 139 



Observations. A single specimen only of this beautiful 

 species has come into my possession. It is very distinct 

 from any species I know, and is eminently distinguished 

 by the flatness of the superior part of its whorls and the 

 spinous tubes placed along the angle. The wide umbili- 

 cus and armature of points are very characteristic. 



C. multiplicata. Plate 5. Fig. 135. 



Description. Shell turrited, somewhat inflated, with 

 numerous rather oblique folds cut by transverse striae ; 



substance of the shell rather thick ; whorls , angular, 



flat at the top ; umbilicus very small ; mouth ovate ; 

 columella with two folds ; outer lip very much thickened, 

 edged, crenate within. 



Length Breadth .2, of an inch. 



Observations. Unfortunately, I obtained but little more 

 than the lower whorl of this species. This, however, is 

 perfect, and displays distinct characters. The thickness 

 of the outer lip is very remarkable, forming a large 

 varix. 



C. plicata. Plate 5. Fig. 136. 



Description. Shell turrited, subventricose, with numer- 

 ous large longitudinal folds on the three last whorls cut by 

 minute transverse striae ; whorls six, angular at the top ; 

 umbilicus very small ; mouth subovate ; columella with 

 two folds. 



Length .4, Breadth 3-20ths, of an inch. 



