160 THE AVASATCn AND BRIDGER FAUN^. 



jaw. The lateral posterior foramen terminates anteriorly opposite the pos- 

 terior border of the orbit. The anterior border of the palatine orbital 

 foramen marks the posterior third of the distance between the orbit and 

 external nares, on the top of the skull. The posterior border marks the 

 posterior edge of the orbit. The pterygoid bones are produced and present 

 backwards an acute external angle. The posterior nai-es are well behind 

 the posterior border of the orbital foramina. The palatine bones are nar- 

 rowed posteriorly between the orbito-palatine foramina, being at the middle 

 of the latter, a little narrower than either foramen. 



The posterior maxilhuy and mandibular teeth are concealed in the 

 specimen, owing to the closure of the jaws. There are four teeth in the 

 maxillary between the canine and the notch for the lower canine. In front 

 of the latter, in the maxillary bone, there are five teeth, of which the third 

 and fourth, counting from the front, are largest. The teeth are all sepa- 

 rated by short interspaces, and are graduated in sizes, the large teeth not 

 being abruptly larger, as in C. polyodon. The crowns are robust, and with 

 round section at the base. They have a low cutting edge \n front and rear. 

 The enamel is roughened by numerous short crowded filiform ridges, as in 

 many other crocodiles, which are worn off in old crowns. 



MeasuremenU of skull. 



H. 



Total length with angles of mandible 700 



Length on superior surface ; parietal bono estimated .'>.30 



Width between external angles of quadrates 300 



Width at orbits 230 



Width at superior canines lt>3 



Width at superior notch 01'5 



Widtli at middle of nares 130 



Width between orbits 050 



Width of nares 047 



Length from end of muzzle to orbit 360 



Length from end of muzzle to lino of canine 180 



Length from end of muzzle to line of notch 100 



Diameter of canine tooth at base 020 



Length of symphysis maudibuli 115 



Tlie ouly difference to be noted between the fragments of the upper 

 jaw of the type specimen and the corresponding parts of this one, is to be 

 seen in the premaxillary teeth. In the former they are larger and are not 

 separated by as distinct interspaces; the third and fourth appear to have 



