45 
TEREBRATULA. 
v 
ANOMIA Linn. 
Gen. Char. Shell an equal sided inequivalved bi- 
valve ; beak of the largest valve prominent, 
perforated ; a pair of curved surfaces on each 
side the beak, and two shelly elongated append- 
ages form the hinge. 
TEREBRATULA subrotunda. 
TAB. XV.— F. 1 and 2. 
Spec. Char. Circular, depressed, smooth; valves 
regularly and equally convex ; beak short. 
Length three-fourths of an inch, rather wider than long ; 
slightly angular on each side the beak ; the larger valve in 
some specimens a little deeper than the other. 
Found in the hardish Chalk about Hornisham in Wilt- 
shire, where they are often preserved of a beautifully silky 
lustre. The shells are scaly, and seem but little altered. 
My friend Mr. Meade has sent me specimens an inch and a 
quarter long from Cornbrach, inclining to a reddish colour, 
seemingly but very little altered, which may be a variety of 
this, but the perforated beak is more protruded, and the 
contour rather inclining to squarish. They were found in a 
soil partaking of Limestone with Ochraceous Iron. Dr. 
Sutton has sent me specimens from Suffolk : Lady Ayles« 
ford kindly forwarded some to me from a Limestone quarry 
near Warwick, with curious crystals of pellucid Carbonate 
of Lime covering the horn-like appendages of the hinge, 
and lining the shell, see £. 2. It is abundant in many 
places. 
