432 Annals of the Carnegie Museum. 



edge has been broken, and the margin of these bones is not entire. A 

 portion of the posterior margin of the right dental foramen is, however, 

 preserved, showing that the animal possessed the dental foramina, and 

 thus was allied to the genus Crocodilus rather than to the genus Alli- 

 gator Cuvier, or the genus Gavialis Oppel, the former of which is 

 characterized by the absence of the dental foramina, except possibly 

 in extreme age, and the latter of which is always without these 

 openings. The foveae on the lower surface of the intermaxillaries 

 which lead from the orifices of the dental foramina are distinctly 

 marked on the under surface of the skull. The snout is strongly con- 

 stricted at the point where the premaxillaries unite with the maxillaries 

 at the dental incisure. The nasal bones do not reach the narial open- 

 ing, their anterior ends terminating between the premaxillaries fully 

 three centimeters from the posterior margin of this opening. The 

 alveolar border of the maxillaries extends backward from the point of 

 union with the premaxillaries, in a widening curve, to a point in ad- 

 vance of the orbital cavities. There does not appear to be much, if 

 any, evidence of lateral compression of the skull about the middle or 

 the maxillaries, as is the case in the skull of many species of recent 

 crocodiles, notably Crocodilus Aincricaniis Seba. The distortion of 

 the specimen to which the skull has been subjected as the result of 

 vertical pressure may have slightly obliterated the evidence of con- 

 striction at the point indicated, in case it existed in life. 



The arrangement of the bones composing the roof of the back part 

 of the skull is essentially like that in the recent genus Crocodilus. At 

 the point where the mastoid and the parietal bone form the inner 

 and posterior margins of the supratemporal fossce there are devel- 

 oped well marked convex bony ridges, rising about four mm. in 

 height above the plane of the upper surface of the bones which have 

 been named. This bony ridge is far more strongly marked than in 

 the recent genus Crocodilus, where it exists only as a vestige. In 

 other respects the upper surface of the skull shows no points of dif- 

 ference from modern types. The under surface of the specimen pre- 

 serves, though greatly crushed, the outlines of the bones of the inferior 

 surface of the skull, and thgse do not seem to diverge in form and 

 arrangement from well known recent types. 



With the skull were associated a few teeth. The alveolar border 

 of the maxillaries and premaxillaries is sufficiently perfect to show 

 that the number of teeth was itlentical with that of the modern genus 



