14 MOLLUSCA FROM THE GREAT OOLITE. 



HINNITES VELATUS, Gold/., Sp. Tab. II, fig. 2. 



PECTEN VELATUS, Goldfuss. Petref., t. 90, f. 2. 



Roemer. Verst., p. 67. 

 SPONDYLTJS VELATUS, Goldfuss. Petref., t. 105, f. 4. 



Testa ovato-orbiculari convexd, auricula untied magnd costellatd, posticd parvd, sub- 

 obsoletd ; costellis radiantibus (circa 30) nodulosis, subaequalibus, distantibus ; inter- 

 stitialibus lineatis ; lineis nodulosis irregularibus. Valvd dextrd planatd costellis lineisque 

 ornatd. 



Shell ovately orbicular, rather oblique, convex, anterior auricle large, posterior small, 

 nearly obsolete, radiating little costa3 (about 30 in the circumference) nodulated, nearly 

 equal, and distantly arranged; the interstitial spaces have unequal and irregular nodu- 

 lated lines, from one to three, being contained in each space. The right valve is flattened 

 and ornamented in a manner similar to the other. 



This species would appear to have a considerable range, both stratigraphically and 

 geographically ; it occurs in the shelly freestone beds of the Inferior Oolite, in the Fullers- 

 earth, Great Oolite, Forest Marble, and Cornbrash. 



Localities. Leckhampton Hill, the Sapperton Railway Tunnel, the entire Minchin- 

 hampton district of the Great Oolite, and in Northamptonshire and Lincolnshire. 



HINNITES TEGULATUS. Tab. II, fig. 3, 3a. 



Testa ovato-orbiculari convexd; valvd sinistrd auricula anticd magnd; posticd subnulld ; 

 costellis radiantibus (32 34) tenuibus, regularibus transverse plicatis ; plicis vel tegulis 

 concentricis crebris sub(equalibus intcrruptis. 



Shell ovately orbicular convex, the left valve with a large posterior auricle, anterior 

 auricle obsolete ; radiating little ribs (32 to 34 in the circumference,) fine, regular, and 

 transversely plicated ; plications concentric nearly equal, closely arranged but occasionally 

 interrupted. 



The radiating little ribs are delicate, regularly arranged, and impressed by the con- 

 centric plications, they are prominent about the middle of the valve, and become finer 

 towards the sides; the right valve is unknown. The figure presents an approximation to 

 that of H. velatus, but it appears to have more convexity and less obliquity; moreover the 

 character of the surface, with its fine regular distinct radiating ribs, is very different from 

 the irregularity observable in the other species. Height, 10 lines; lateral diameter, 8 lines. 



Locality. Minchinhampton Common. Rare. 



PLICATULA. Lamarck, 1801. 



Gen. Char. Shell adherent, inequivalve, irregular, not eared, umbones terminal and 

 pointed, no external area; ventral margin rounded, and more or less plicated. Hinge 

 with two large diverging cardinal teeth in each valve, the teeth are striated laterally, and 

 there is a conical fossa between them to receive the ligament, which is almost internal. 



