xxxvi INTKODUCTION. 



There is a long and prominent paroccipital process, which is applied 

 to the bulla. 



There is no long, outwardly projecting process beneath the opening 

 of the meatus auditorius externus. 



The mastoid is small and not prominent, and the condyloid foramen 

 opens on a bony ridge. 



There is a caecum which, in the great majority of species, is curiously 

 contorted and coiled. 



The prostate is salient. 



The bone in the corpus cavernosum is grooved and not dilated and 

 hilobed anteriorly. 



Except in Otocyon there are not * more than two true molars above 

 and three below, while, except in Icticyon, there are never less than 

 two true molars above and two below. 



The characters by which the Canida differ from the ^luroidea 

 are : 



They have an auditory bulla which is but very incompletely sub- 

 divided by a bony septum. 



They have a long and prominent paroccipital process, and a large 

 glenoid foramen. 



There is a relatively longer meatus auditorius externus. 



The condyloid foramen opens on a bony ridge and is conspicuous. 



There is always an alisphenoid canal. 



The orbit is never enclosed by bone. 



There is a caecum which, in the great majority of species, is curiously 

 contorted and coiled. 



There are no Cowper's glands. 



There is a large, symmetrically-shaped bone in the corpus cavernosum. 



There are generally four premolars and two true molars above, and 

 four premolars and three true molars below, while there are generally 

 two tubercular teeth (devoid of a cutting-blade) behind the sectorial 

 tooth both above and below. 



* Abnormalities of course excepted. 



