FROM THE INFERIOR OOLITE. 495 



species is a very strong and massive one ; but the specimen is quite 

 as well preserved as the usual run of fossils from the same beds. 



Sowerby quotes it as from the Inferior Oolite, but gives as its 

 locality Ilminster, where it is found in the Middle Lias. 



Gryph^a Sollasii, n. sp. Plate XY. figs. 9, 9 a. 



Left valve deep and evenly convex, with a slight irregular depres- 

 sion running slantways across it from the front of the umbo back- 

 wards, which may be accidental rather than indicative of a lobe. 

 Umbo small and but slightly developed, and curving half-way round, 

 so as to approach Exogyra. Lines of growth irregular, bearing 

 occasional impressions of sharp thorn-like spines in the marginal 

 regions. Marginal curve deep and continuous. 



Eight valve very thick and flat, with a short, straight hinge-line, 

 which shows the nucleus of the umbo at the extreme anterior 

 corner. 



Locality. Dundry. One specimen in the Bristol Museum. 



Dimensions. 21 lines long, 15 wide, and 9 deep. 



Gryphcea plicata, Lye. Ann. & Mag. Nat. Hist. 1850, and Brown, 

 Foss. Conch, p. 149, and t. 61. figs. 26-28, is quite a different shell. 



Exogyra Davidsont, n. sp. Plate XY. figs. 10, 10 a. 



Left valve large, convex, smooth. Umbo proximate and very 

 much curved backward over the hinge-margin. Surface of attach- 

 ment large. Substance of shell lamellar, thin towards the margins. 

 Hinge-line very large. Surface covered by fine and irregular growth- 

 marks. Convexity greatest along the central line of the shell, where 

 it forms a rounded ridge with steep sides, which arches very rapidly 

 down to the umbo. 



Dimensions. About 2| inches long, 2 inches wide, and 1 inch deep. 



This fine fossil is from the Inferior Oolite of Erocester Hill, and it 

 appears to be a well-marked species, somewhat like Exogyra sinuata, 

 Sow., of the Greensand, but steeper. The hind margin of my specimen 

 is unfortunately defective. It was apparently attached to another 

 specimen of the same species. The sandy beds from which it comes 

 appear to belong to the lower part of the Murchisoni-zone. 



Chapuis & Dewalque, in Foss. Lux. pt. 1, t. 32. fig. 5, figure an 

 Exogyra something similar but much smaller as 0. arcuata, Lam., 

 var. suilla, Schl., referring to Goldfuss. Goldfuss's figure, however, 

 of 0. suilla is quite unlike our shell ; and a Norman specimen 

 in the British Museum shows it to be rightly classed as a Gryphcea. 



Exogyrtjs globulus, n. sp. Plate XY. figs. 11, 11 a. 



Shell small. Left valve with the surface rather indistinctly nodu- 

 lous, very convex, forming a sharply rounded ridge near the centre 

 of the valve, from which the anterior side slopes down at an angle 

 of 45°, and the posterior at about 15° from the perpendicular. 

 Margins forming an almost complete circle, so that the depth equals 

 the length, and is a little less than the width. Umbo small but well 

 developed, concave posteriorly, the central ridge becoming on it a 



