

Till 



Fig. 31. 



on itself in t\\" different din ( i,m- : tVcuu before \<> 1 hind l.y its |'-t. -rinr Ixmlcr. ami 

 behind to before by its anterior bonier. It is livd t-> tin- sup< rmaxillary bom- hi it- 

 middle part, through the medium of a particular Imiiy lamina, ami it very incniiii ! t.-l\ 

 ition which c.niciirs to form the maxill.iry sinus. In tin- skeleton 

 then- is ul.-<> found behind, ami at the base <>f this tiirbinate.l liunc, a vast opening which 

 i- t tally do.-. .1 in ti.e fie.-h c. . million by the pituitary membrane. The maxillary sinus 

 i- imt prolonged in its interior. In the smaller ruminants, the cavity of the sinus is 

 elo.-..l by tin- maxillary turbiiwted bone iu a more complete manner than in the Ox. 



15. Votner. This is a very large thin bone, resting only on the inferior half of the 

 median suture of the premaxillaries. 



10. Premaxillary bone. In the Ox, the inferior part of the 

 posterior border is convex, and cannot rest on a hori/ntal 

 piano by all its points at the sune time. The condyle is 

 convex ill its smnll diameter, and slightly concave laterally. 

 The coronoid process is bent backwards and outwards. The 

 body does not show any alviolm for the tusk, because this 

 tooth is absent in these animals; but it is hollaed by eight 

 alveoli for the incisor teeth. The two branches of the Ixrae 

 are never consolidated, but remain movable on each other 

 during life. 



17. Hyoid bone. The hyoid bone of Ruminants is always 

 composed of seven pieces; the styloid nucleus, whose pi 

 is not constant in solipeds, is never absent in these, and 

 assumes the projxjrtions of a second snull branch. The 

 anterior appendix is very short and thick. 



B. HEAD OF THE PIG. 1. Occipital bone. The occipital 

 bone in this animal is not bent anteriorly; but the tran.-v.-r.-e 

 protuberance representing the curved line.- i.>rms, m verthele-*. 

 as in the Horse, the summit of the head. This eminence, which 

 is excavated on both sides on the posterior face, unites in front 

 with the parietal bone, which abuts on the occipital at an 

 acute angle. There is no external occipital protuberance, 

 properly speaking, and the styloid processes are very lon^ and 

 directed downwards. 



2. Parietal lone. This bone is very thick, and deprived 

 of an internal protuberance. The process concurring to cir- 

 cumscribe the orbit is short, and joins neither the /.ygonmtic 

 or temporal bones; the orbital arch is completed by a liga- 

 ment. The superciliary foramen, disposed as in the < >x. open* 

 in front into a channel that descends to the na^il 1 n. s. The 

 orbital fommeu is formed by the frontal bone only. There 

 is no mortice for the union of the frontal with the sphenoid 

 bone, and the maxillary sinus is prolonged into the parietal 

 bone. The frontal bone of the pig articulates with the MIJXT- 

 maxillaries. 



3. Frontal bone. The frontal bone of the 1'ig is very thick 



tuberance- 2 * Parietal an< l short, and does not join the temporal or y.\ --omatic bone ; 

 bone- 3 Frontal bone. l ''C orbital arch is completed by a ligament. The superciliary 



A Superciliary fora- foramen, disposed as in the Ox, abuts in a channel that 



men- A' Channel des- descends on the nasal bones. The orbital foramen is formed 



cemling from it. i, by the frontal bone only. There is no mortice for the union of 



Zygomatic process; 5, the frontal with the sphenoid bone ; and the frontal sinuses are 

 Zygoma- 6 Lachrymal prolonged into the parietal. The fiontal bono of the Pig 



bo ne> jj ' Lachrymal articulates with the supcrmaxillaries. 



canals 7 Supermax- * &/''" <"'/ '"" . The sphenoid of the Pig is very short, but 



illary bone. c Inferior the subsphenoidal processes are extraordinarily developed and 



orifice of the Biipermax- flattened before and behind. There is no snbsphcnoidnl canal, 

 illo-deutal canal 8 and the sella tnn-ie < is de.-p. and limited behind by a very salient 

 Nasal bone' 9 'Pre- cre.-t. A single canal replace.- the' foramen rotundum and the 

 mnxillary bone. great sphenoidal fi.-.-iir.-. a.-, in the Ox. The \\im_rs, Mi-lilly 



.-alient, are articulated by suture with the fiontal Imiie. 



5. Temjwral bone. The articular surface of this bone re-.-mbles that of rodents : it is 

 not limited po.-teriorly by a subcondyloid eminence, and. in addition, oilers a wider 

 ti:in-\er.-e surface. The /yu'omatic process articulates with the jugal Jmne l.y the whole 

 xteiit of its pn.-terior Innder. A cre.-t leading from the external auditory hiatus to the 



IIKAD OF THE PIG; 

 A.NTKUIOB FACE. 



1, Summit of occipital pro- 



