BY H. H. SCOTT AND lLIVK 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 saving they repre- 

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

 bo relied upon accordingly. 



COMPAUATnE SKULLS. 



Male Female 



Character of Measurement. . Skull. Skull. 



in. in. 



From tip of beak to occipital condyles 21 ... 19 



Internal length of the brain cavity 6J ... 6 



Maxillary notch to tip of the beak 11 ... 11 



Tip of beak to .superior nares 14 ... 14 



Length of palate in a middle lino 125 ••• 125 



Tip of beak to end of alveolar margin 10 ... 9J 



Height of skull at vertex 8? ... 8 



Breadth at squamosal processes Hi ... 10 



Brcadtii of brain cas© at parietals 8 ... 7^ 



Ditto of brain superorbital ridge 10 ... 10 



Ditto across beak at base 5i ... 5 



Ditto across middle of beak 4 ... 3'i 



Ditto of pre-maxilla 2 ... 1| 



Width of condyles 4J ... 4i 



Height of foramen magnum 15 ... If 



Width of foramen magnum Ij ... IJ 



Length ot ramii of lower jaws 19^ ... 16J 



Height of ramii at coronoid processes 4.^ ... 35 



Length of tooth line 9\ ... 91 



L'cngth of symphysis 2i ... 2\ 



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 shaqily 

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

 can without fear be sexed so constant is this character ; 

 the ramii of adult males nearly reach 20 inches, and (iio- 

 females as nearlv reach 17 inches. The notes already 

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

 the crania. 



Our data respecting the living animals supplv the 

 information that the lower jaws of the males protnide at 

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

 accounts for fiftv ner cent, of the excess of ramal length, 

 and explains the reason for the male and female crania 

 bring similar in most of their measurements, and yet 

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

 dibles. Our phot« will make this partly evident, as the 



