54 
sidered as varieties of it, but which differ in several 
points, almost, if not quite, enough for them to be 
considered as forming a distinct species. 
The surface of the casts of these specimens is very 
distinctly punctated ; they are from Cambridge ; I have 
others also from Limerick by favour of S. Wright, Esq. 
TEREBRATULA obesa. 
TAB. CCCCXXXVIII .—fig. 1. 
Spec. Char. Ovate, gibbose, front elevated 
considerably, with a slight broad sinus in 
the middle ; beaked valve regularly convex 
to the edge ; beak incurved, shorL 
A large gibbose shell, rather more obtuse at the front ; 
the lesser valve is depressed a little on each side of the 
elevated front, and also, near the edge, into the central 
sinus, otherwise both valves are very regularly convex ; 
the width and depth are each about two thirds of the 
length ; the beak has no keels upon its sides. 
From Chalk, at Norton Bevant, near Warminster. 
It very strongly resembles Anomia ampulla of Brocchi, 
p. 446. but that not being a Chalk-fossil is probably dis- 
tinct ; I have not seen a specimen. 
TEREBRATULA bucculenta. 
TAB. CCCCXXXVUL— Jig. 2. 
Spec. Char. Rather square, with rounded 
sides, convex; front produced, truncated, 
very slightly elevated ; beak short. 
The valves of the Terebratula are nearly equal, thin 
edges almost level, and not sinuated ; the front is so 
produced as to give the sides an inflated appearance, 
like the cheeks of a Fox ; the length and breadth are 
nearly equal ; the surface smooth. 
Sent from the neighbourhood of Malton ; it has much 
the aspect of some Green-sand fossils, but is not sili- 
ceous. I know not what stratum it comes from. Its 
characters are very conspicuous. 
