46 



A MUCH flatter shell than E. pentangulatus^ which it much 

 resembles ; it has also fewer whorls. From Mr. Gilbert- 

 son's collection. 



Euomphalus serpens (Phillips' Devon and Cornwall, 94?) 

 wants the angle on the upper surface and is more concave 

 beneath. 



EUOMPHALUS carbonarius. 



TAB. DCXXXIIL— ^g-. 4 to 7. 



Spec. Char. Discoid^ depressed^ smooth ; whorls 

 few, subtrigonalj bicarinated ; keels distinct, 

 larg-e, rounded, forming the boundaries of the 

 upper and under surfaces, the lower one widest 

 in diameter; margin convex; apertureorbicular. 



A SMALL species with strongly marked characters : it is 

 smooth, equally concave on both sides, the lower surface 

 being considerably the largest; the two keels bound the 

 margin, from which they are separated by shallow furrows 

 produced by the convexity of the surface between them ; 

 the aperture is orbicular because the keels are foi'med en- 

 tirely in the thickness of the shell. 



I am indebted for this interesting fossil to Dr. Rankin 

 of Carluke and Mr. Purdue ; the following note, obligingly 



