XIII 



PHYLUM CHORD ATA 



5()0 



The lower cjirnassial is thus tlic last of the series. In the Dogs 

 (Caiiida') the_ I'uriiiula is usually — 



•3 14 2 ,^ 



and in the Bears (Ursid<'e) it is the same. 



3 



In the Pinnipedia there are always fewer than ^ incisors, and 



o 



carnassials are not developed. The pre-molars and molars have a 



W 



Fin. 1197.— Left lower carnassial teeth uf Carnivora. /, Felis ; //, Canis ; ///, Herpestes ; 

 IV, IjUtra ; V, Meles ; VI, XJrsuS. l,;uiteriur lobe (paracDiild) uf blade; 2, pusteriur 

 lobe (protoeoiild) of blade ; 3, inner cusp (metacouid) ; 4, talon (hypoconld). (After Flower 

 ■and Lydekkei-.) 



compressed, conical, pointed form. The prevailing dental formula 

 of the Seals is — 



.314 1 _, 



'■ 2'^- l'^-4'"'T = ^^- 



In the Walrus tlie adult formula is — 



.1 1 3 ,^ 



%. -, c. ^, p. r^, m.^ = 18. 



The upper canines take the form of large, nearly straight tusks. 



In the large order of the Rodents the dentition is remarkably 

 uniform, and, in all its general characters, resembles what has 

 already been described in the Rabbit. But the second, smaller 



