TUKSIOPS TURSIO. 



35 



versa; in others sliort and narrow, and tlic opposite. The table of nieas- 

 nrements is as folFows, the sknlls being arranged in order of their abso- 

 Inte length : 



Measurements of hventij-onc skulls of l'ursio2)s iursio. 

 [Ucasuriiueiits iu centimctLTS.] 



The sknlls, it will be observed, vary bnt little in leugtii ; they rise by 

 gradations of C""" and less from 4-3.2 to 47. 8^'". 



We shall first examine the table for indications of sexnal differences 

 in the relativ^e length of the beak as compared with the total length of 



