518 DELPHINID.E. 



In the relative size of the teeth, their thick conical 

 crowns with slightly recurved and incurved pointed sum- 

 mits, and also in the well-defined coat of enamel, the fossil 

 much more resembles the Grampus. In the skull of a 

 Grampus in the College of Surgeons, the number of teeth 

 is ifEj-f ; in the fossil cranium it is J-^fJ ? In the latter 

 the enamel has been changed to a light bluish-grey, the 

 dentine to a yellowish-brown. In the fossil lower jaw the 

 number is precisely defined by the actual teeth, or by the 

 distinct sockets : these parts have been restored in the 

 upper jaw of the Stamford specimen. 



The Phoceena crassidens differs from the Phoceena melas 

 in the relatively larger temporal fossae, by which it re- 

 sembles the Grampus ; and it differs from PL orca, and 

 resembles the Ph. melas in the continuation of the inter- 

 maxillary bones backwards to the nasal bones, which they 

 join ; but, in the breadth of the intermaxillaries, it is 

 intermediate between the Ph. orca and Ph. melas. In 

 the latter species, Cuvier correctly states that " the inter- 

 maxillaries include nearly two-thirds of the breadth of 

 the beak, whilst in the Grampus they scarcely form one- 

 third :" but, in the Phoceena crassidens, the intermaxillary 

 bones form more than half the breadth of the beak. A 

 more definite distinctive character of the fossil skull is 

 the appearance of part of the vomer (fig. 216, *>,) upon 

 the bony palate, in the same relative position and to the 

 same extent as in the skull of the common Porpoise ; for 

 the vomer is not visible on the palate in the Grampus, 

 the Round-headed Porpoise (Ph. melas), the Beluga, or 

 the Delphinus griseus. 



By comparing figure 213 with that of the skull of the 

 Bottle-nosed Dolphin (DelpUnus tursio) in p. 472 of Bell's 

 ' British Quadrupeds, the difference will be readily appreci- 



