A New Crocodile from Wyoming. 



433 



Crocodili/s, and the arrangement of the teeth and their relative sizes, 

 so far as it is possible to ascertain the facts from the skull under con- 

 sideration, was the same as in Crocodihis. Three successional teeth 

 are preserved on the left hand side of the upper jaw, and the crowns 

 of two larger teeth were found detached from the skull and in the 

 matrix beside it, l'\ idently belonging to the 

 same specimen. These teeth differ some- 

 what from those of the recent genus Croco- 

 dihis in being somewhat more compressed 

 and trenchant and not as conical. They 

 are not, however, as obtuse as the teeth 

 described by Owen as belonging to the genus 

 Goniopliolis, although upon the crown, par- 

 ticularly upon the inner surface, they dis- 

 tinctly reveal the neatly defined longitudinal 

 ridges, which appear to agree with the de- 

 scription given by Owen. The two lateral 

 ridges, one anterior and the other posterior, 

 midway between the convex and concave surfaces, are in both cases 

 sharply defined, and even more sharply than in the genus Crocodiliis. 

 The larger of the teeth that have been preserved appears to the writer 

 to be, reckoning from the front. No. lo in the left series. 



Fk;. I. a, Tooih of G. 

 Gihitorei, nat. size ; /', outline 

 of section at base ; c, outline 

 of section at middle of crown. 



i:)IMENSIONS OF THE SKULL OF CILMORE'S CROCODILE. 



Length of skull on median line 385° '^'^• 



" " " from posterior extremity of quadrate to end of snout 44-5° " 



Transverse diameter of snout across premaxillaries 7.20 " 



" " " " at junction of maxillaries and premaxillaries 4.00 " 



" " " skull at front of orbits IO.80 " 



" " " " at upper ends of mastoids 12.00 " 



" " " " at end of quadrates 20.00 " 



Longitudinal diameter of left orbital foramen 4.C0 " 



Transverse " " " " " 5-20 " 



Longitudinal " " " postorbital foramen 4-50 " 



Transverse " " " " •' 3-5° " 



Diameter of supratemporal foramen 4.00 " 



The specific characters by which this species may be distinguished 

 from the other species of the genus Goniopholis described from North 

 America appear to be the very closely pitted superior surface of the 

 bones of the skull, the existence of the elevated ridges partly sur- 



