4S 



DIMENSIONS OP THE SKULL OF EUPHYSETE8 GRAYII, 



Length of skull from extremity of snout to the hinder 



edge of occipital condyles 



Ditto of skull from hinder edge of occipital condyles to 



the posterior wall of the right nostril 



Ditto of snout from its extremity to the bottom of the 



antorbital notch of the maxillary 



Breadth of head between the orbits 



Greatest width of ridge dividing cavity of head 



Ditto of snout between the antorbital notches of the 



maxillary . . 



Ditto of snout at half distance between its extremity and 



the antorbital notch of maxillary 



Ditto of snout at extremity 



Width between outer edges of intermaxillaries at the line 



di'awn between antorbital notches of the maxillary .... 

 Distance between the suborbitary (or here, superorbitary) 



foramina 



Distance between anterior points of the intermaxillaries . 

 Greatest distance between the inner walls of the raised 



edges of the maxillaries 



Width of left nostril .... 



Length of ditto , 



Width of right ditto 



Length of ditto 



Height of occipital crest above the right nasal bone .... 



Ditto of ditto above the left nasal bone 



Width of the occipital foramen 



Distance between the outer edges of the occipital condyles 

 Greatest breadth of the occipital at its lower part .... 

 Height of the occipital from the inferior edge of the 



basilar to the summit of the head 



Length of lower jaw in a straight line 



Ditto of the symphysis 



Ditto of the series of dentary alveoles 



Distance between outer edges of the articular condyles . . 

 Height of the mounting branches at base . . . . . . , 



Width of jaw at the place where the symphysis commences 



Inches 



THE OS HYOIDES. 



The OS hyoides of our animal is remarkably similar to that 

 of the true sperm whale, and principally differs in that the 

 lateral pieces are still more rounded ; while the anterior 

 apophyses of the middle piece are deficient. This structure 

 is, therefore, further removed from that of true whales and 

 dolphins than even the os hyoides of the genus Catodon. 



