88 MOLLUSCA FROM THE GREAT OOLITE. 



The surface ornaments nearly resemble A. striato-costata, Munster, Goldf. Pet., 

 tab. 134, fig. 18; but the latter shell has much larger dimensions, is somewhat more 

 convex, and has not the subquadrate figure of our species. It is somewhat rare. The 

 name from John Wilton, Esq., of Gloucester, who has investigated the minute anatomy of 

 the univalve Mollusca. 



Lateral diameter, 6 lines ; height, 5 lines. 



Locality. Minchinhampton Common, in a bed of soft Oolite, which underlies the 

 planking. 



ASTARTE RECONDITA, PML, sp. Tab. XII, fig. 10. 



Syn. PULLASTRA RECONDITA, Phil. Geol. York., 1, t. 9, f. 13. 



Testa parvd, ovato-oblongd, subdepressd ; umbonibus obtusis, anticis ; margine cardinali 

 subhorizontali, basi ellipticd curvatd, superficie striis concentricis paucis magnis ; lunuld 

 excavatd. 



Shell small, ovately oblong, rather depressed ; umbones obtuse, anterior ; hinge border 

 elongated, nearly horizontal ; basal margin curved elliptically ; lunule excavated ; the 

 surface near to the umbones has a few large obscure concentric striations, which disappear 

 towards the middle of the shell. 



In figure, this little shell bears some resemblance to the young of Astarte rhomboidalis, 

 but it is more flattened, and is destitute of the posterior angle of that species ; the few 

 rugose striations near to the umbones is another distinctive feature. 



Locality. Ponton, Lincolnshire, where it has occurred rather sparingly in the coarse 

 Oolite. In "Yorkshire, Professor Phillips records it in the Great Oolite of Cloughton 

 Wyke. 



CYPRINA. Lam. 



Gen. Char. Shell equivalve, inequilateral, transverse, subglobose or subovate ; umbones 

 curved obliquely ; ligament external ; hinge with three diverging cardinal teeth, and a 

 remote laminar or lateral tooth in each valve ; muscular impressions, two, lateral ; pallial 

 rapression slightly angulated posteriorly; margins of the valves close, smooth internally. 



CTPKINA LOWEANA. Tab. XIII, fig. 2 2 d 



Testa transvers im ovali, Icsvi, convexd; umbonibus antemedianis crassis ; lunuld ova fa 

 parvd, area lanceolatd, latere postico subcompresso, inferne subangulato ; striis concentricis 

 tenuissimis irregularibus frequenter obsoletis. 



Shell transversely ovate, smooth, convex ; umbones anterior, thick, and large ; lunule 

 ovate, but slightly excavated ; area lanceolate ; anterior side rounded ; posterior side rather 

 compressed, and slightly angulated at its inferior extremity ; the surface has very fine 

 irregular concentric striations, which in the greater number of instances are obsolete. 



