the Cretaceous and Tertiary Formations. 453 



have a broad transverse oval outline, witli a faint superior emar- 

 gination. The free hypapophyses preserved are short, and tri- 

 angular transversely. 



Sridth ( 



1 of axis, without odontoid process,. 12-3 lines. 



I of ball, . .. 7-10 " 



Depthofball, 5-75 " 



Transverse extent of distal end of quadi-ate, ... 10- '* 



Length of basioccipital, 13-46 " 



This species was probably about twelve feet in length. The 

 specimens representing it, so far as now known, were found by 

 Mr. H. B. Sargent, of the Yale College party, in the yellow 

 Cretaceous limestone, on the south side of the Smoky Eiver, 

 u estern Kansas. 



Tertiary Eeptiles. 

 Orocodilus ziphodon, sp. nov. 



Some of the most interesting remains of fossil reptiles discov- 

 ered by the Yale party, during their explorations last summer 

 in the Tertiary beds of the Green River basin, west of the Rocky 

 Jiountams, were those of Crocodilians, several of which prove 

 on examination to be new to science. One of these, a small 

 animal to which the present name may be applied, presents 

 characters which separate it at once from any known Crocodilian, 

 inng or extinct. Perhaps the most marked feature is seen in 

 ^e teeth, which resemble those of some of the Dinosaurs. 



ne crowns are much compressed, and somewhat curved, espe- 

 ^lallv m those apparently pertaining to the front part of the 

 ^nes^ The sides are smooth, the edges very sharp, and marked 

 ^th tine serrations from the base to the apex. The skull was 

 /igose, and in places deeply pitted. The quadrate, to judge 

 rom a single detached specimen found with one series of the 

 the T^' ^^^ probably belonging to them, is quite stout, with 



e lower surface smooth, and the distal end subtriangular 



outline. The back of this reptile was covered with thick 

 de^p 'it ^^^^^ united by suture, and marked with numerous 



Length of crown of tooth, ^'^"'''™^^' 8- lines. 



I^ansyerse diameter at base,:--:::' ::..". - '^-60 " 



Tramv^'*^"''^ *^^^nieter at base, - 4-75 " 



Wlf^-*^'^"'^^^^ of distal end of quadrate, 16'80 « 



«^»cal diameter, on median line, — - 7-90 " 



eenTM P^Si°aens here described were found by Mr. H. B. Sar- 

 nearV !:i ^, Nicholson, and the writer, at the Grizzly Buttes, 

 Eoce^P ^ndger, Wyoming. The geological horizon is upper 

 ^' or perhaps Miocene.* 



*'nii8 Journal, vol i, March, 1871, p. 192, and May, 1871, p. 322. 



