43 



DIIIENSIOXS OF THE SKULL OF EUPHYSETES GRAYJI. 



Length of skull from exti'emity 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 



drawn between antorbital notches of the maxillary 



Distance between the suborbitary (or here, superoi-bitary) 



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. 

 16 1-2 



7 



14 

 3 1-2 



5 

 2 



3 3-4 



4 1-2 



1 1-4 



9 1-5 



2 1-5 

 2 



1-2 



5 1-4 

 1-2 

 1-2 



1-4 

 1-4 



THE OS HYOIDES. 



The OS liyoides of our animal is remarkably similar to that of 

 tlie 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 



