270 



M. with ten or twelve tuberculated fpires, of a yellow- 

 ifli-brown colour, tapering to a fine point; the volutions 

 are curioufly wrought, with three or four feries of crenu- 

 lated ftriae between the tuberculated fpiral ridges : aper- 

 ture fmall, oval, ending in a flight canal : the bafe fpirally 

 Ilriated. 



The tubercles in large fhells extend into ftrong conic 

 fpires, on the lower volution; and fometimes run together 

 into a fharp fpiral ridge, like a fcrew. 



This very rare BritiJJi fhell has been found dXWeymouth 

 by Mr. Bryer ; it was about an inch and a half in length, 

 and half an inch broad at the bafe. 



Mr. Penkant's fliell is of this fize, and was found on 

 the coall of Northumberland. 



Petiver has given the figure of a fhell, very much like 

 that in the BritiJJi Zoology, but does not flate it to be En- 

 glijfi. Vide Petiver's Gazophylacium Naturce, Tab. 5. 



17. 

 TuBERcuLARis. M. witli ninc Or ten, flender, taper, tuberculated volu- 

 tions, feparated only by a flight deprefl^on: colour chef- 

 nut-brown : rty5'<r,\' pointed; aperture fmall, oval, ending 

 in a canal, fomewhat enclofed by the Columella turning 

 inward. Length a quarter of an inch. 



We 



