TO GEOLOGY. 59 
recurved ; cardinal and lateral teeth rounded; cicatrices 
not deeply impressed; the lines of growth numerous and 
deeply furrowed, causing a crescent like appearance ; cavity 
of the shell deep—of the beaks deep and rounded, having 
no visible furrow ; margin crenulate. 
Diam. .2, Length .3, Breadth .2, of an inch. 
Observations. Differs from impressa in size, obliquity, 
strie, and the deeply seated lunule. 
Seven species have been noticed in the strata of Great 
Britain, from the Great Oolite to the Crag—one only in 
the London Clay. In M. Deshayes’s valuable Tertiary 
Tables we find fifty-nine, of which thirty-one are from the 
Paris basin (Eocene). Twelve are from Bourdeaux (Mi- 
ocene). Mr Say has observed five in the Tertiary of 
Maryland, and Mr Conrad two from the Tertiary of Clai- 
borne. 
GENUS GRATELUPIA. Des Moulins. 
G. Moulinsii. Plate 2. Fig. 33. 
Description. Shell subtriangular, inflated, gibbous over 
the umbo, very finely and transversely striate, nearly equi- 
lateral ; obtusely angular behind, subemarginate on pos- 
terior basal margin ; lunule large and lanceolate ; margin 
entire. 
Diam, 1, Length 1.4, Breadth 1.9, of an inch. 
