the Cretaceous mid Tertiary Formations. 455 



tlie premaxillaries, which in the skull described bj 



- T Leidy are elongate, and have, to the entire length of 



i. a ratio of about one to three. In the second species, 



i the name preceding this description may be given, the 



uding parts have the approximate ratio of one to four, 



M hy a very perfect skull in the Yale Museum, as well 



^lier remains which give all the essential characters. 



iphysis in this species is quite short, and, at the poste- 



'T margin, is met by the anterior extremity of the 



The nasal bones project forward, and form a septum 



xtenial nostril, as in the Alligator. The cervical verte- 



''ra\ moreover, have hypapophyses resembling those in that 



genus. The quadrate is much constricted at its distal articular 



end. Its lower surface is concave, with a sharp longitudinal 



ndge, exterior to the median line. 



jength of skull, on upper surface, .„ „, „ ,,„ 



l;'^"gi h of premaxillaries, 3 " ' 6 ' " 



i ransverse diameter of quadrate, at distal end, 22-50 " 



> frtical diameter, on median line, 7' " 



^The precise relations of this species to G. aptits Leidy, which 

 b^d f?^i ^^ from a single cervical vertebra, cannot at present 



The known specimens of the present species were collected 

 |^}-^Mr. H. B. Ziegler, Mr. A. H. Ewing, Mr. E. Whitney, and 

 ' e ^mter, at Grizzly Buttes, Wyoming. 



Orocodilus Orinnelli, sp. nov. 

 thp ^P^cies, which was of medium size, closely resembles 

 ^precedmg in the form and proportions of the quadrate, but 

 pressfvl °°^ i^ in the more slender jaws, and the more com- 

 C P?^^*®^' and grooved teeth. The symphysis is also 

 traS^^ 1^® splenial does not reach it. The basioccipital is 

 thp ii,rJ?^' T.^nder and elongate, with a deep vertical groove on 

 eU... f ^ .^'^^- The axis is quite slender, and has two deep, 

 Ct 1^'^'' '^^^ ^J ^id« on the floor of the neural canal, and 

 odont -1 P ^"^^ °^°^® separated, on the superior surface of the 

 marm^ Focess. All the vertebrse are strongly striated on the 

 few nit Tk ^^*^^^1'^^ faces. The scutes are free, and with 

 been f, n . Specimen here described appears pot to have 

 ^Q tuUy adult, although nearly so. 



Length r>f , Measurements. 



Greate//y?,P^y«i«' finches, 8-5 lines. 



fe^^^rs^^i^f ^^^"^^^'' IS :: 



-^«f axis, with odontoid process", 21-75 " 



