518 DELPHINIDA. 
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 
12=1; ; in the fossil cranium it is (}=5? In the latter 
the enamel has been changed to a light bluish-grey, the 
is 
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 Phocena crassidens differs from the Phocena melas 
in the relatively larger temporal fosse, by which it re- 
sembles the Grampus; and it differs from Ph. orca, and 
resembles the P/. 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 Phocena 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, 7,) 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 (Delphinus tursio) in p. 472 of Bell’s 
‘ British Quadrupeds, the difference will be readily appreci- 
