7 
MU REX quadratus. 
TAB. CCCC X.—Jig. l. 
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- 
boidal 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. CCCC X.—fig.% 
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. 
T he stria? 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 
