660 ERIGNATHUS BARBATUS BEARDED SEAL. 



Measurements of the principal parts of tJte skeleton in Erignathus larbatus 



(9 ad.). 



MM. 



Length of the skull 230 



Length of the cervical vertebrae 250 



Length of the dorsal vertebras 800 



Length of the lumbar vertebras 390 



Length of the sacral vertebras 175 



Length of the caudal vertebras 350 



Length of the scapula 210 



Length of the htunerus 162 



Length of the radius 140 



Length of the manus 185 



Length of the pelvis 320 



Length of the femur 153 



Length of the tibia 310 



Length of the pes 380 



Length of the whole skeleton 2195 



Length of the fore limb (exclusive of scapula) 487 



Length of the hind limb 843 



The series of skulls of this species shows that the female is 

 rather smaller than the male, with a rather weaker osseous 

 structure. While old males have rudimentary but quite strongly 

 marked anteorbital processes, equally old female skulls some- 

 times show not the slightest trace of them. The largest male 

 skulls do not exceed a length of 260 mm., while one marked 

 as female attains nearly 240 mm. The Bearded Seal, although 

 often stated to be the largest Phocid of the northern seas, has 

 the skull much smaller than either Halichcerus grypus or Cysto- 

 phora cristata, while the skeleton of the latter indicates an an- 

 imal of much greater bulk. Adult female skulls of the Bearded 

 Seal, in fact, scarcely exceed in linear dimensions very large 

 old male skulls of Phoca vitulina. 



