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. DCXXXIII. —Jig. 4 to 7. 
Spec. Char. Discoid, depressed, smooth ; whorls 
few, subtrigonal, bicarinated ; keels distinct, 
large, rounded, forming the boundaries of the 
upper and under surfaces, the lower one widest 
indiameter; 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 formed 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 
