56 



THE BONES. 



protuberance is obtuse, and gives rise on eacb side to the superior curved lines ; in the 

 Sheep, tliese cm-ved lines are very salient and occupy the summit of the head. 



The styloid processes are short and much bent inwards. The basilar process, wide, 

 short, and thick, has a groove in the middle of its external face ; this groove is sometimes 

 absent in the Sheep and Goat. 



The condyloid foramina are double, sometimes triple ; the superior foramen does not 

 pass dii-ectly into the cranium, but goes to a vast conduit that opens.behind on the lateral 

 margin of "the occipital foramen, and which terminates in front by two orifices, one 

 entering the parieto-temporal canal, the other opening on the external surface of the 

 bone. The foramen lacerum is divided into an anterior and posterior foramen by the 

 mastoid portion of the temporal bone. 



Parietal hone. — The parietal bone in the Ox does not occupy the anterior aspect 



Fig. 27. 



ox's head; akteeioe taoe. 

 1, Mastoid process; 2, Superciliary, or supra-orbital foramen; 3, Zygoma: 4 

 Lachrymal bone ; 5, Maxillary spine ; 6, Inferior orifice of the supermaxillo-dental 



CRD3.1> 



of the head, but concurs with the occipital to form the base of the neck. It represents a 

 very narrow osseous plate, elongated transversely, and curved at its two extrpmitiea 



Safrid^ef The tteS^'Vr " *" "^* T° *^« '^^^'^^ bone.'Vher^Trfno 

 parieta ridges. The mtemal protuberance is only marked by a slight elevation of the 

 internal plate : for the most part it belongs to the occipital bone ^ 



The parietal bone of the Ox is developed from three centres of ossification and the 

 middle nucleus .s even primarily divided into lateral halves -but tS centres are 

 consolidated with each other at an earlv neriod as wpH b» wftl +?,„ * • '''^""f.^ ^^% 

 thp nccinifnl Tt ^„„„ „ i • i ^"*" ,"=""/ pefi™, as well as With the anterior portion of 

 ^cartedttPmallt ht -f-"^ \^^ formation of the parieto-temporal canal, and is 

 The naript«?^il ^f T'^^^l^ ''^'"'} ^""^"^J^te with the frontal sinuses. 



ihe parietal bone of the Sheep and Goat is relatively much lander than that of the Ox 

 It participates in the formation of the parieto-temporal canal, and has no sinuses 

 and'pa^tTtner"-'"^ ^""'"''"*^' ^"^ '^^^^^ ''"^ ^^^^ -* -P-*! toTe temporal 



In the Ox, this bone is extremely developed, by itself occupying the anterior half of the 



