476 



TEE CAT. 



[chap. XIII. 



If we examine the basis cranil of a "bear (Fig. 193) we see that its 

 auditory bulla consists of a single bone, instead of two as in the cat. 

 It is but little prominent, but is much prolonged outwards as the 



c^r- 



JFig. 103.— Pakt of Basis Ckanii of Beau {Flower). 



a. Posterior opening of ali-splienold canal. 



«'. Aiiti^iinr oiiciiiiij; of same canal. 



c. Coiiilyloiil foiaiiicii. 



car. C'aroticl furaiiicii. 



c. Knstat'liiaii canal. 



Iiiiinciliatc^ly abcivc tlif liglit-li.iml oml of ilie 

 liiiu Icailiii}; fiiiui tin; li'ttcr c, is n lar^'i' 

 opi'iiiii;; — the furaiiiun laccrum aiiterius — 

 at wliich tlio cflrolid artery rcainicais, after 

 having traversed tlic petrosal, and Ijcnding 



rnnnd the skull to ro-onter the skull at this 



foramen. 

 rf. Glenoid foramen. 

 /. Fonimcn laeenim postcrius. 

 m. JIastoid process. 

 mil. Meatus aiiditorius cxternns. 

 II. Foramen ovale. 

 p. Par-oeciiiital process, 

 s. Stylo-niastoid foramen. 



floor of the bony meatus auditorius extcrnus(^;?^/). Towards its 

 hinder inner end is a considerable foramen {ct(r) for the internal 

 carotid artery, which here enters the petrosal, and having traversed 



