INTBODUCTION. xix 



that of the Cat *. The meatus auditorius externm has a rather prominent 

 inferior margin at its outer aperture. There is no conspicuous carotid 

 foramen, because the carotid canal f opens posteriorly into the foramen 

 lacerum posterius \. Thence it runs forwards through the inner wall 

 of the bulla, and opens anteriorly close to the inner side of the groove 

 for the Eustachian tube . Upon emerging from the anterior end of 

 the canal, the artery turns upwards, and, after forming a loop, enters 

 the skull through the foramen lacerum medius. The paroccipital 

 process (/j) is very peculiar in shape. It is long, prominent, and 

 laterally compressed. It is somewhat applied to the bulla, though to 

 a less extent than in the Cats or Felidte || . The mastoid is moderately 

 prominent. The condyloid foramen is very conspicuous, opening as it 

 does on a ridge which extends from the paroccipital to the condyle ^[. 

 That small channel in the skull, known as the alisphenoid canal **, is 



t 



Section of auditory bulla of Dog (Flower). 



am, external auditory meatua ; BO, basioccipital bone ; car, carotid canal ; e, Eustachian 

 canal ; g, glenoid foramen ; s, septum ; Sq, squamosal bone ; T, tympanic bone : 

 t, tympanic ring. 



constantly present, and there is also a large glenoid foramen. The 

 bony palate is but very rarely prolonged backwards beyond the hind- 

 most molars. The ethmoid and ethmoturbinal bones are always very 

 large and extremely convoluted (in relation with the highly developed 



* Op. cit. p. 67, fig. 36. t Op. cit. p. 83. 



Op. cit. p. 62. Op. cit. pp. 66 & 298. 



|| Op. cit. p. 82. H Op. cit. pp. 57 & 58, fig. 29. 

 ** Op. cit. p. 447. 



