164 TOE WASATCH AND PRIDCKU FAUNiE. 



Meagurementu of skuU. 



M. 



Leugth to anf^les of mandible 500 



Length to posterior iKtrdcr of iiarietals 370 



Willi 1) hcuvteii cxtiTiial angles of (juutlrates 218 



Width af orbits 180 



Width of supeiior caniues 1'20 



Width (if .su]iorior notch 060 



Width of iiiiddle of nares 085 



Width between orbits 033 



Width of nares 030 



Length from end of mozzlo to orbit ;ioO 



Length from end of muzzle to canine 120 



Length from end of muzzle to notch 0G9 



Diameter of canine tooth at base 015 



Length of symphysis mamlibuli 080 



The vertebrse preserved are five lumbars; four with centra nearly com- 

 plete. They have nearly round cups, and the shoulder at the base of the 

 ball is not so prominent as in the lumbars of C. clavis described. The edge 

 of this and of the cup, is marked with distinct short longitudinal ridg'es. 

 What characterizes these vertebrje as diflPerent from the lumbars of C. clavis 

 is the presence of a wide open groove of the inferior median line of the 

 centrum. The sides bounding these grooves are regularly rounded and not 

 angulated. This fact, with the absence of chevron facets, satisfies me that 

 these vertebrae are not caudals, which are always grooved below. 



Measurements of a lumbar vertebra. 



M. 



Length of centrum, including ball 041 



_,. . , < vertical 022 



Diameters of cup < . ^^ 



( transverse 022 



Elevation with neural spine 063 



Expanse of prezygapojdiyses 049 



In some of these lumbars the neurapophysial suture is obliterated, 

 indicating the maturity of the individual. 



Professor Marsh distinguishes his C. affinis from the C. elliotti of Leidy 

 by the shorter premaxillary bones and a few other characters. I find my 

 crania to agree nearly with the former in the characters in question 



Crocodilus hetkrodox Cope. 



Sygtemotic Catalogue Vertebrata, Eocene of New Mexico; U. S. G. G. Survey W. 100 Mer., by G. M. 

 Wheeler, 1^75, p. 34. Alligator hclcrodon Cope, Prooced. Amer. Philos. Soc. 1872, p. 544. Annual 

 Report U. S. Geol. Snrv. Terrs., F. V. Ilayden, 1872 (1873), p. (il4. 



Plate XXIV, ligs. 11-18. 



The anterior and posterior teeth of this species differ exceedingly in 

 shape; the former are fiattened, sharp-edged, and slightly incurved ; the 



