FROM THE INFERIOR OOLITE. 525 



Cardium ptjlsatttm, n. sp. Plate XVIII. figs. 9, 9a. 



Shell subspherical, nearly circular. Umbones large and promi- 

 nent, but incurved so as to extend considerably beyond the hinge- 

 margin and to be proximate. Margins evenly convex, meeting at a 

 small angle. Greatest depth a little behind the hinge-line. Surface 

 smooth, except on the posterior part, where it is ornamented by 

 about sixteen close, simple, rounded, and rather large longitudinal 

 striae. Shell-structure very thin. 



The closed shell measures 12 lines long, 10 wide, and 8 deep. 



I have obtained this shell from the Inferior Oolite of Dundry. 

 In the Jermyn-Street Museum there is a similar shell from the 

 borders of Ponton Heath, near Grantham, and another and much 

 larger specimen from Cold Comfort. 



Lucina ? btjrtonensis, Lye. 



1863. Lucina ? burtonensis, Lye. Suppt. Gt. Ool. Moll. t. 40. fig. 20. 



Shell orbicular, very flat, smooth. Umbones central, very small, not 

 rising above the general surface, acute and pointed forward. Lunule 

 indistinct. Escutcheon lancet-shaped, bounded by a distinct angle. 

 Ventral margin slightly less rounded than the others. Valves 

 meeting at a very small angle. Surface flatter posteriorly, almost 

 smooth, having numerous flat, minute concentric markings of rather 

 unequal width. 



There are two small specimens of this For est- Marble shell among 

 the Dundry specimens in the Bristol Museum. 



Kellia Etheridgii, sp. n. Plate XVIII. figs. 12, 13, 13 a. 



Shell transversely ovate, almost the exact shape of an egg, con- 

 vex, attenuated behind. Eront margin moderately convex ; poste- 

 rior margin very convex. Umbo very anterior, situated about one 

 fourth along the width of the shell, direct, minute, and incurved, just 

 appearing above hinge-line. Hinge-line curved ; two distant very 

 distinct teeth on the left valve, and two indistinct diverging ones 

 on the right valve. Surface covered with unequal, sharp, distinct, 

 thread-like concentric lines. 



It is about a line in length. 



Two specimens from the Barnack Rag in the Sharp Collection 

 in the British Museum. 



These pretty little shells are very nearly allied to those figured by 

 Sowerby from the Cretaceous rocks. 



Sph^ra eimbriata, n. sp. Plate XVIII. figs. 10, 11. 



Shell orbicular, very convex, somewhat produced and flattened at 

 the superior corners. Umbones rather small, distinct, rounded, 

 proximate, slightly anterior and curving subspirally forward. 

 Margins nearly equally convex, inclined to each other at a moderate 

 angle. Hinge-line curved, with a prominent rounded tooth just in 

 front of the umbo, and a larger, longer, and more indistinct one behind. 

 Ligamental groove long, narrow, and external. Lunule indistinct, 



