BY H. H. SCOTT A?il> ULIVE E. LORD. 



107 



feet eight and a half inches, between vertical rods, and 

 the female was exactly nine feet in length. 



Having dissected these animals, and prepared their 

 skeletons, we have every confidence in saying they repre- 

 sent normal sex types of the genus, and that the data, may 

 be relied upon accordingly. 



COMPARATIVE SKULLS. 



Character of Measiarement. 



Male 

 Skull. 



in. 



21 



From tip of beak to occipital condyles ... 



Internal length of the brain cavity 6| 



Maxillary notch to tip of the beak ... 11 



Tip of beak to superior nares 14 



Length of palate in a middle line 12| 



Tip of beak to end of alveolar margin 10 



Height of skull at vertex 8f 



Breadth at squamosal processes 11^ 



Breadth of brain case at parietals 8 



Ditto of brain superorbital ridge 10 



Ditto across beak at base 5h 



Ditto across middle of beak 4 



Ditto of pre-maxilla 2 



AVidth of con.dyles 4f 



Height of foramen magnum ... If 



Width of foramen magnum If 



Length ot ramii of lower jaws 19^^ 



Height of ramii at coronoid processes 4^^ 



Length of tooth line 91- 



Length of symphysis 2i 



Female 

 Skull, 

 in. 

 19 

 6 

 11 

 14 

 121 



8 

 10 



10 

 6 



31 



n 



■•-8 



16i 

 31 

 9i 



2i 



A glance at this table will show the curious manner 

 in which the male and female skulls simulate each other 

 in the vast majority of their measurements, and yet sharply 

 contrast in the length of the loAver jaws. A single ramus 

 can without fear be sexed so constant is this character ; 

 the ramii of adult males nearly reach 20 inches, and the 

 females as nearly reach 17 inches. The notes already 

 given as to the skulls and their profiles will serve tO' sex 

 the ci'ania. 



Our data respecting the living animals supplv the 

 information that the lower jaws of the males protrude at 

 least an inch and a half beyond the upper maxillae. This 

 accounts for fifty ^oer cent, of the excess of ramal length, 

 and explains the reason for the male and female crania 

 being similar in most of their measvirements, and yet 

 showing so sharp' a. contrast in the matter of their man- 

 dibles. Our photo will make this partly evident, as the 



