VOLUTA tricorona. 

 TAB. DCXllI.—Jig. 2. 



Spec. Char. Ovato-rhomboidal, transversely striated, 

 costated, spire short, acute ; whorls crowned by 

 three rows of short spines ; costce thin, as long as 

 the volutions. 



1 HIS Volute is distinguished at first sight by its sharp ribs, 

 each of which has three very short spines upon its upper part, 

 and by the striae extending over the whole of the whorl. 



Collected from the clay at Primrose Hill, near Camden 

 Town, with the two preceding species, by Mr. Wetherell : 

 it is rare. 



Fig. 1. represents a young specimen of V. nodosa, Tab. 

 399, for comparison ; it is from Highgate, where it was not 

 uncommon. 



VOLUTA denudata. 



TAB. DCXlll.— fig. 3. 



Spec. Char. Elliptical, ribbed ; ribs short, thick, 

 with a short spine near the upper part of each ; 

 lower part of the whorl striated ; inner lip thick, 

 extending far over the whorl; columella with 

 several irregular plaits. 



VV ELL distinguished by its oval form, smooth surface and 

 the thick inner lip ; it resembles Voluta rarispina, Lara. ; 

 but that shell has longer spines, a less regular form, and is 

 much more strongly striated near the beak. 



This shell has long been known in the sandstone of the 

 Bognor Rocks ; but until Mr. Bowerbank, with much per- 

 severance, cleared a series of good specimens, it had not 

 been recognised as a species ; one individual, cleared since 

 the figure was engraved, measures three inches long. The 

 same species has also been found at Brentford, but it is 

 rare. 



