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 striz ; 
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 strie; whorls six, angular at the top ; 
umbilicus very small; mouth subovate ; columella with 
two folds. 
Length .4, Breadth 3-20ths, of an inch. 
