54 



sidered as varieties of it, but which differ in sereral 

 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.— /^. 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, short. 



A. LARGE gibbose shell, rather more obtuse at the front; 

 the lesser valve is depressed a little on each side of the 

 elevated front, anil 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. CCCCXXXVIII.— /^. 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. 



