MUREX quadratus. 



TAB. CCCCX.— /^. 1. 



Spec. Char. Short conical, transversely 

 striated and obscurely bicarinated ; base 

 produced ; beak short ; aperture sub-rhom- 

 boidal. 



A. FEW irregular lines of growth decussate the regular- 

 ly elevated striae upon the surface of this short, rhom- 

 toidal Murex ; it has no costae, and the sutures instead 

 of being varicose, are only slightly marked. 



Probably this is a rare shell ; only one individual has 

 fallen under our notice ; it was considered as the young 

 state of the following, with which it was found mixed, 

 until the want of costae proved it to be distinct. 



This is a Blackdown Fossil ; the shell is as usual re- 

 placed by Silex. 



MUREX Calcar. 



TAB. CCCCX.— >V 2. 



Spec. Char. Ovato-acuminated, transversely 

 striated, costated ; last whorl bicarinated ; 

 each suture supports two or three long, 

 sharp spines ; aperture round, with a long 

 canal. 



X HE striae upon the surface of this Shell are few, ele- 

 vated, and partially granulated ; the costae upon the 

 spire are numerous and sharp; on the last whorl they 



