1 II 



jaw, to that it u exposed when the mouth U that. The pecin'c character it given by tin 

 two unusually developed and distinct bony ridge* extended from the anterior part* of thr 

 orbits and converging u they advance forwards. The uumbcr of alveoli in thr |>rrmxilUry 

 is 4 I ; in the maxillary, 14 14 ; in the dentanr. 15 15. 



Mu. Brit. 



720. The skull of the Crocodiku biporcahu. 



Ossification ha* extended over the left temporal fossa, from the mastoid and pottfrutiUl to 

 the parietal, covering U with a bony roof like that in the Turtles (Ckrlone). The outer walU 

 of the tocketa of tome of the teeth have been removed in the upper jaw, which exposes tin 

 great depth and curvature of thoae socket*, and the reeeai at the inner tide of the baar of 

 each, in which was lodged the matrix of the mrcMsionsl teeth. The number of the alveoli 

 is, in the premaxillary, 4 I ; in the maxillary, 1414 ; in the dentary, 1515. 



i J I . The skull of the Crocodil** biporcatiu. 



Beaidea the two ordinary perforations of the premaxillary bone receiving the two anterior 

 mandibular teeth, the second and third pain have also excited progressive absorption of thr 

 same bones, and have partly perforated them. The number of the alveoli is, in the prr- 

 maxilkry, 4 4 ; in the maxillary, 14 14 ; in the drntanr, 1515. 



Presented by Sir Everard Hume, Bart., F.R.S. 



The skull of the Crocodi/iu biporfahu. It shows the same number of the tet-tli. 



Pretemtfd by Dr. Natkaniel WMch, F.R.S. 



7-J3 The skull of the Crocodil** biporcatut. It shows the same number of the teeth. 



Hunter tan. 



7 J \ The skull of the Crocodiltu biporcatiu. The constituent bones are numbered 

 according to the Table of STSOSTMS. The number of alveoli is, in the pit- - 

 maxillary, 55 ; in the maxillary, 15 15 ; in the dentary, 14 14. 



Prf9enffd by Dr. lli-ndfrnon. 



725. The skull of Crocodtitu biporcabu. The number of alveoli is, in the premax- 

 illary, 4 4 ; in the maxillary, 14 14 ; in the dentary, 1515. Hunt, ,,,,, 



726 The skull of a Crocodile, which resembles in the proportions of the length and 

 breadth of the maxillary and premaxillary bones the preceding specimen. The 

 premaxillo-palatine suture has the same undulating transverse direction, but 

 bends more forward and nearer the nasal aperture at its middle part ; thin 

 however is probably only an individual peculiarity. The ecto-ptcrygoid has the 



