34 
HELIX. 
Gen. Cuar. Shell globular or orbicular, with a 
convex or conoidal spire; Aperture entire, 
wider ‘than long, diminished in its upper part, 
~ by the’ projection of the last turn but one of 
the spire. A small spiral umbilicus runs nearly 
through it. 
HELIX carinatus. 
TAB. X.—Upper and lower figures. 
Spec. Cuar. Spire short, conoidal, of three or 
four turns; a raised, flat, ribband-like projec- 
tion passes from the lateral edge of the mouth 
along the middle of the last turn, till it meets 
the inner edge of the mouth, whence it con- 
tinues between the volutions to the end. Um- 
bilicus open. 
EE 
Greatest diameter nearly two inches, length about one 
inch and an half. Upper part of the whorles, as well as 
the ribband-like projection, transversely striated. 
I was favoured with this specimen from near Settle in 
Yorkshire, by Mr. Ducket ; it is in solid grey Limestone ; 
the inside cast is distinct in some parts where the shell ap- 
pears to have been broken. That part of the shell which 
remains, is now neatly transparent Carbonate of Lime. I 
expect this is not common, as I haye never seen it in any 
other collection. 
