PLATE CLXXX. 



characteristic of this species. At the first glance this shell appears to be 

 an intermediate kind between Lister's shell and the Murex Carinatus 

 of Pennant, and ourselves: indeed the principal difference vve perceive 

 between the true M. Despectus and Lister's shell is, that the former 

 has the whorls of the spire rather more ventricose, and distinctly 

 marked with two slightly elevated spiral lines ; from Murex Carinatus 

 it differs principally in the very prominent angulations of the anfrac- 

 tibus, where the ridges appear, and more particularlv in the strong 

 depression between the upper ridge, and the suture of the whorls. 



The Murex despectus, at pesent under consideration, is certainly 

 very rare, except in the North of Europe, where we are led to suppose, 

 from what Linnaeus says, it is not uncommon. 



The only specimens we have ever seen of this kind are from 

 Greenland. 



HAVING thus ascertained, as we may reasonably believe, the 

 true Linnsan Murex Despectus, it remains in this place to propose 

 the following emendations and additions to the description of two 

 Shells figured in the course of this work, namely, Murex Despectus, 

 Plate XXXI. and Antiquus, Plate CXIX. which, in common with 

 other testaceological writers, we had misconceived. 



