CROCODILIA. 161 



been in contact. While the form of the symphysis of the mandible is the 

 same in both, the ramus of the type is stouter. 



The vertebrae are mostly injured. A cervical has a simple anterior 

 hypapophysis with a concavity on each side of its base, and an obtuse 

 keel on the middle line behind it. The ball is nearly round, and is bounded 

 by a strong shoulder. The external slope of this shoulder is marked by a 

 few ridges, and by considerable rugosity at the base of the neural arch. In 

 a dorsal, the ball is a little deeper than wide, and the middle line behind the 

 hypapophysis is a keel. The ball of a lumbar is wider than deep, and the 

 external border surface of its shoulder, as well as that of the cup, are 

 rough with short ridges. The first caudal has a robust diapophysis, and a 

 fossa on the median line below. The chevron facets are large. 



Measurements of vertebra:. 



M. 

 Length of a cervical 160 



Diameters of base of ball ^^'''^^'^='1 " ^^ 



c transverse 033 



Length of a lumbar 061 



Diameters of a lumbar^ vertical 0:J2 



( transverse 041 



Length of first caudal 060 



vertical 030 



transverse 028 



Diameters of ball < 



The right half of the pelvis is preserved, wanting the distal extremities 

 of the pubis and ischium. It has the typical crocodilian character of the 

 perforation of the acetabulum open anteriorly by the failure of contact 

 between the pubis and ilium. The ilium is much like that of the Missis- 

 sippi alligator, so much so as to render description superfluous. 



Measurements of pelvis. 



Length of ilium ". 160 



Depth of ilium 092 



Width of contact with ischium 035 



Width of ischium at base 080 



Width of ischium at middle 033 



Width of pubis at base 040 



Width of pnbisat middle 019 



Two dermal bones preserved are probably from the lateral dorsal region, 

 although this is not certain. One of them is large, the other small; both 

 are oval in shape, the larger rather narrowly so, and neither have a dis- 



