129 



have been proportionately about as large. The anterior series of maxillary 

 teeth were rather larger, and the posterior series smaller. 



Detached portions of both quadrates accompany the other portions of the 

 skull. They are somewhat peculiar in several anatomical points. The an- 

 terior surface is unequally divided by a conspicuous ridge, descending to 

 within an inch of the articular surface for the mandible. The grooved or 

 trochlear condition of the latter surface is much more decided than in the 

 mugger. or the American crocodile. 



Measurements taken from the specimen above described are as follows : 



Inches. 



Length from occipital border to end of muzzle 20 



Breadth of cranium at occipital border between prominent angles of squamosals. 7 



Breadth of cranium at postorbital angles 5£ 



Breadth of cranium between temporal orifices . . 1 



Breadth of forehead between orbits 1£ 



Breadth of temporal orifices l£ 



Fore and aft diameter of the same 1§ 



Length of parietal 2 J- 



Length of frontal ~)h 



Breadth of frontal where it joins the post-frontals 2| 



Fore and aft diameter of the orbits , 2§ 



Length of face in advance of the orbits 13| 



Breadth of face outside the fifth maxillary teeth G« 



Breadth of muzzle as formed by premaxillaries .'. 5 



Breadth of muzzle at notch back of the latter 4 



Length of premaxillaries 6 



Breadth of nasal orifice , 2A 



Fore and aft diameter of the same 24 



Thickness of premaxillaries in advance of the same a 



Estimated length of entire alveolar border 144 



Space occupied by the anterior five maxillary teeth 3^ 



Space occupied by the posterior five* maxillary teeth 3 



Breadth of articular surface of quadrate for the mandible 2£ 



A detached basi-occipital, obtained near Little Sandy River, may, perhaps, 

 belong to the same species as the preceding. The occipital condyle has 

 nearly as great a vertical as a transverse diameter, the former measuring 15 

 lines, the latter 17 lines. 



The last summer Dr. Joseph K. Corson sent, as a gift to the museum of the 



Academy of Natural Sciences of Philadelphia, a specimen consisting nearly 



of the whole of the lower jaw of a large crocodile. He discovered the fossil 



imbedded in a green sandstone in the vicinity of Fort Bridger. In removing 



it from its matrix it was much broken, and most of the teeth were destroyed. 

 17 G 



