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 striee ; whorls six, angular at the top ; 

 umbilicus very small ; mouth subovate ; columella with 

 two folds. 



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



