266 PAL-aEONTOLOGY. 



** Below this line tlie formation must be accounted as Cretaceous, on 

 account of the presence of the Dinosaurian Agaihaumas sylvestris; and 

 those above it, as I have already pointed out, Eocene, on account of 

 the types of Mammalia contained in them." Dr. Hayden has regarded 

 these beds as transitional between Cretaceous and Tertiary. Mr. 

 Lesquereux regards them as Tertiary, on the ground of the type of 

 their flora. There is no stratigraphical break or important change in 

 mineral character between the undoubted Cretaceous and the un- 

 doubted Tertiary groups. Messrs. Lesquereux and ]N"ewberry have " pro- 

 nounced this whole series of formations [the coal-bearing formations 

 of the Eocky Mountains, from the lowest marine to the highest fresh- 

 water beds] as of Tertiary age, and some of the beds to be as high as 

 Miocene. The material on which this determination is based is 

 abundant ; and the latter must be accepted as demonstrated beyond all 

 doubt. I regard the evidence derived from the moUusks in the lower 

 beds, and the vertebrates in the higher, as equally conclusive that the 

 beds are of Cretaceous age. There is, then, no alternative but to 

 accept the result, that a Tertiary flora was contemporaneous with a 

 Cretaceous fauna, establishing an uninterrupted succession of life across 

 what is generally regarded as one of the greatest breaks in geological 

 time. . . The circumstance of the discovery of a Mesozoic Dinosaur, 

 Agatkaumas sylvestris, with the cavities of and between his bones 

 stufl^ed full of leaves of Eocene plants (Lesquereux), would prove this 

 proposition to be true, had no other fossils of either kind ever been 

 discovered elsewhere." 



The following new species are described: — Eeptilia: CUdastes 

 planifrons, Sironectes anguliferus. Pisces : Pelecorapis varius, Portheus 

 Mudgei, IcJithyodectes perniciosus, PachyrMzodus leptopsis, TetTieodv.s 

 (new gen.) pephredo, EncTiodus petrosuo, Empo Merillii, E. contracta, 

 Sporelodus (new gen.) Janevaii, Hhineastes pectinatus, Amyzon com- 

 mune, Clupea theta. L. C. M. 



Cope, Prof. E. D. Eeport on Vertebrate Palaeontology of Colorado. 



Ann. Eep. Geol. Surv. Territories for 1873. (See under Hayden^, 



p. 118.) 



The descriptions of extinct Yertebrata have previously appeared in 



Cope's Palaeontological Bulletin, Nos. 14-17, and Bull. U.S. Geol. 



Surv. Territories, nos. 1, 2. See above. 



Cope, Prof. E. D., — Le Conte, &c. [Discussion on CJielonia and 

 Dinosauria from Cretaceous deposits of Colorado.] Proc. Ac. Nat. 

 Sci. Philadel. 3 ser. vol. iv. pp. 10, 11. 



Cox, Prof. E. T. Colletosaurus Indianensis. See p. 114. 



Dawkins, Prof. W. B. On the Northern Eange of the Fallow 

 Deer in Europe. Nature, vol. xi. p. 112. 



Thinks that the Fallow Deer did not inhabit Northern and Central 

 Europe in Pleistocene and Prehistoric ages, but believes that it was 

 introduced into Prance by the Eomans. C. E. De E.- 



