546 PROCEEDINGS OF THE GEOLOGICAX SOCIETY. [JunO 17, 



16. On the " Waterstone Beds " of the Keuper, and on Psetjdo- 

 MORPHOus Crystals of Chxoride of Sodium. By G. W. Ormerod, 

 Esq., M.A., F.G.S. 



[The publication of this paper is unavoidably deferred.] 



(Abstract.) 



Between Salcomb Mouth and the Eiver Sid, and between Bud- 

 leigh Salterton and Littleham Bay, several beds of ripple-marked 

 " Waters tone " occur, and also pseudomorphous crystals of chloride 

 of sodium. One small fragment of Waterstone exhibits apparently 

 traces of reptilian remains. In conclusion, the author draws atten- 

 tion to the fact that pseudomorphs occur over the greater part of 

 the Triassic area in England. 



17. On the Discovery of the Eematn^s of Cephalaspidian Fishes in 

 Devonshire and Cornwall; and on the Identity of Stegano- 

 dictyum, M'Coy, with genera of those Fishes. By E. Eay Lan- 

 kester, Esq., Ch. Ch., Oxford. 



[Communicated by Henry Woodward, Esq., F.G.S.] 



I BEG to draw attention to a most important and interesting dis- 

 covery which has been recently made in the cabinet of my late 

 friend Lieut. Wyatt-Edgell. 



Hr. Salter, in looking through the collection, came upon a spe- 

 cimen of the supposed Sponge Steganodictyum Oornuhicum, from 

 the Lower-Devonian slates of Mudstone Bay, which, with his usual 

 sagacity, that naturalist at once observed bore strong resemblance 

 in shape and in structure to the shield of Pteraspids ; and on com- 

 parison vdth other specimens and M'Coy's figures, he came to the 

 remarkable conclusion that M'Coy's supposed Sponge is actually 

 the cephalic plate of a Pteraspidian fish. Having, by the kind- 

 ness of my friend Mr. Henry Woodward, had an opportunity of 

 examining Mr. Wyatt-EdgeU's specimens, and comparing them with 

 Professor McCoy's figures, I can most fully endorse Mr. Salter's 

 determination — the nacreous, cancellated, and striated layers de- 

 scribed by Professor Huxley, and so eminently characteristic of the 

 Heterostracous Cephalaspidae, by their presence leaving no room for 

 doubt. It was obviously desirable that Mr. Wyatt-Edgell's Pte- 

 raspid should be compared with the only other species known from 

 beds of the same age, viz. the Scaphaspis Dunensis, originally de- 

 scribed by Eoemer as a Cephalopod. This Mr. Woodward and I 

 were fortunately able to do, since the reputed single specimen of 

 Roomer's fish-plate fromDaun,in the Eifel, forms part of our National 

 collection. Though the specimen from Devonshire is by no means 

 as satisfactory an example as we may hope hereafter to obtain, it 

 is sufficiently well preserved to indicate a head-shield larger than 

 any from our Comstones, and of that simple ovoid form which 

 characterizes the genus Scaphaspis, and of which S. Lndensis,S. trim- 



