BRITISH FOSSILS. 



the author seems to liave doubted the propriety of separating these 

 closety allied species, and he has accordingly thrown together not 

 only the P. rotata and the P. ornata, in which view we think the 

 English specimens will bear him out, but also the more flattened 

 form P, aspera, from the oolites of France and Switzerland 

 (Oxfordien, "terrain a chailles''), or, as it appears when partly 

 abraded, P. suhlcevis. 



As explained above, we regard these as distinct, and in this 

 opinion we have the concurrence of Mr. S. P. Woodward in support 

 of what appears to have been the late Prof. E. Forbes' view. More 

 lately (1848) Prof. M'Coy quoted this fossil as from the great oolite 

 of Minchinhampton, probably an error, as Dr. Wright has since 

 pointed out in the careful description above cited. We have seen 

 his specimen at Cambridge, and there is no doubt it is of the 

 same species as ours. Lastly, in a supplementary paper (1854, 

 Ann. and Mag. Nat. Hist., vol. xiii.). Dr. Wright has stated that, having 

 examined the original specimen of Agassiz's, P. granulosa, from the 

 great oolite of Ranville, he has convinced himself of their identity 

 with the British species. Specimens also of P. Gervillii, Ag., from 

 the original locality, the " Kellovien rock of Chaflbur, Department 

 du Sarthe, communicated by M. Michehn and M. Loriere, were so 

 entirely like those from the Inferior Oolite of Gloucestershire, that 

 he would have mistaken one for the other had he not previously 

 marked them.'' The vertical range of this species, then, even if we 

 do not admit its identity with P. aspera and P. suhlcevis, would 

 appear to be considerable. 



Localities. — Inferior Oolite. In the upper beds of this forma- 

 tion at Shurdington Hill ; CoRNBRASH of Rushdon, Northampton- 

 shire. [Dr. Wright.] 



Foreign Localities. — Terrain Jurass. des environs de Doubs, 

 collected by M. Renard Compte (Agassiz) ; Great Oolite of Ran- 

 viUe, Calvados ; Oxford Clay, near Boulogne ; Kellovien of 

 ChaufFour, Sarthe. [Dr. Wright.] 



Description of the Plate. 



Fig. 1. Upper surface of a very round specimen of Echinopsis rotata, natural size, 

 shewing the anal area and apical disk. (Coll. Geol. Surv.) 



Eig. 2. Lateral view, the secondary tubercles are scarcely sufficiently evident in our 

 figure, which is from an abraded specimen. 



