76 



THE CAT. 



[CHAP. in. 



more than twice as long as it is high ; but its anterior half is higher 

 than its posterior, and presents two foramina, one of very considerable 

 size, the spkeno -palatine, foramen directly over a very much smaller 

 posterior palatine foramen (Fig. 43, B). More than the hinder half 

 of the inferior margin of this ascending plate is smooth, free, and 

 concave ; the rest of that margin joins the maxilla. Its hinder end 

 joins the pterygoid. The hinder half of its superior margin joins the 

 orbito-sphenoid and the pre-sphenoid, to which latter the concavity 

 its of upper margin is adjusted. Its more anterior portion is applied 

 against the outer side of the ethmo-turbinal. The horizontal 

 lamella (Ji) projects inwards (from the anterior two-thirds of the 

 inferior margin of the ascending lamella), and joins its fellow of the 

 opposite side in the middle line, and there also joins the inferior 

 margin of the hinder part of the vomer. Its anterior margin is 

 convex, and adjoins the hinder margin of the palatine plate of the 

 maxilla of the same side.. Its hinder margin is concave and free, 

 forming the posterior limit of the bony palate and the anterior 

 boundary of the meso-pterygoid fossa. The posterior palatine 

 foramen (3) very near to, or at, its anterior margin. 



The palatine articulates with the maxilla, the vomer, the lachry- 

 mal, the os planum, the orbital plate of the frontal, the pre-sphenoici, 

 and the orbito-sphenoid. 



36. The VOMER (Fig. 49, v) is a single, thin, median bone 

 grooved above, and extending down vertically from the basi-sphenoid 



Fig. 44. INSIDE OF RIGHT HALF OF MANDIBLE. 



an. Angle, 

 c. Coronoicl process. 

 ur. Ascending ramus. 

 lir. Horizontal rainus. 



sj/. Symphysis. 



y. Condyle. 



14. Inferior dental foramen. 



and ethmoid, to the upper surface of the bony palate, thus completing 

 a vertical median partition between the nostrils. It is a very 

 long and narrow bone, very obliquely quadrangular in shape. Its 

 hinder portion, however, expands horizontally, to support and unite 

 with the inferior and hinder parts of the ethmo-turbinals its hinder 

 end under-lapping the anterior part of the pre-sphenoid. In front 

 of the expanded part, the grooved upper surface of the vomer 

 receives within its groove the lower edge of the mesethmoid ; while, 

 still more anteriorly, the septal cartilage of the nose is received 

 within the same groove. The lower margin of the vomer unites 



