1871.] HtTLEE — BEPTILIAK SKULL. 199 



M. MAECOtr thought that the difficulties iu regarding these beds 

 as of freshwater origin were greater than the author supposed. The 

 absence of fossils in gypsum, though almost universal, was not total. 

 He had himself seen three specimens of Trigonia in gypsum from 

 Stuttgart. 



Mr. Tate mentioned the discovery by Mr. Burton of marine 

 fossils in the Eed Marl, in one instance in combination with vege- 

 table remaias. He commented on the sharp demarcation observable 

 in Ireland between the Ehaetic beds and the marl below, whereas 

 it was almost impossible to separate them from the Lias above. He 

 doubted, however, whether the true relations of the Ehsetic beds 

 were to be worked out in this country. As to the fossils of the Sutton 

 Stone, they were all purely Liassic. 



Mr. Btjetobt stated that the fossils from the Eed Marl came from 

 a spot about five miles from Eetford, in the direction of Gains- 

 borough, but he had not seen them in situ. There are, however, 

 no Ehsetic beds within some miles. 



The Eev. Mr. Winwood, in the absence of Mr. C. Moore, from ill 

 health, inquired whether the author regarded the "White Lias as 

 Ehsetic, or Liassic. 



Prof. Eamsat, in reply, was quite willing to accept marine fossils 

 as coming from the Eed Marl. The fact of Esilieria, a brackish or 

 freshwater form, occurring in certain bands was in favour of his 

 views, as he considered that at intervals the saltness of the water 

 in such a lake as he had suggested must have varied. He could not 

 accept the probability of oxide of iron having been deposited in a 

 large sea-area to such an extent as to colour the sands. All rocks 

 that could be proved to be of marine origin, even when they con- 

 tained iron, were not stained red unless by infiltration from above. 

 He pointed out that the old area of the Caspian was far larger than 

 the lake in which he had suggested that the Kew Eed Marl had been 

 deposited. If, as was more than probable, there had been during 

 all geological time continental areas somewhat in the same positions 

 as those of the present day, thero must have been large areas of 

 inland drainage in which some such deposits as those in question 

 must of necessity have been formed. 



2. Note on a Laege Eeptilian Skull /i-om Bkooke, Isle op "Wight, 

 probably Dinosauhiak, and referable to the Qenus leuAisroDoiir. 

 By J. W. HuLKE, F.E.S., F.G.S. 



[Plate XI.] 



It is remarkable that so little is known of the skuUs of the "Wealden 

 Dinosauria, the more so as their other remains have been procured 

 in some abundance in the south-east of England and the Isle of "Wight 

 during the fifty years which have elapsed since Dr. ManteU's disco- 

 very of an Iguanodon's tooth in the quarry near Cuckfield. Hypsi- 

 lophodon Foccii is, I believe, the only one the form and a great part 



