364 



SKELETON OF THE FOWL 



lower jaw is connected with the squamosal by a movably 

 articulated bone, the quadrate, which probably corresponds 

 to either the incus or the malleus of the rabbit; (5) there 

 is only a single auditory ossicle, the columella ; (6) there 

 are no teeth. 



The fowl's skull may be readily divided into cranial and 

 facial portions, which are loosely connected together, and 

 capable of slight moyement upon each other. The cranial 

 portion consists of the cranium proper, or brain-case, and the 

 auditory capsules : the facial part is formed by the jaws and 

 the olfactory capsules. 



QJ B G J D 



Pig. 47- Gallus bankiva. Tlie skull from the right side. (a. m. m.) 



A, articular surface of tlie mandible. AT, anterior tympanic recess, leading 

 to Eustachian tube. B, pterygoid. C, occipital condyle. D, palatine. 

 E, rostrum. F, mandibular foramen. FO, foramen ovale. FR, foramen 

 rotundum. FZ, zygomatic process of frontal bone. Q-, supra.augular. 

 H, dentary. IS, xnter-orbital septum. J, jugal. L, laorymal. M, maxilla. 

 MP, maxillo-palatine process of maxilla. Iff, nasal. OF, optic foramen. 

 FM, premaxilla. PT, posterior tympanic recess. Q, quadrate. Q, J, quad- 

 rato-jugal. SF, olfactory foramen. SZ, zygomatic process of squamosal. 

 TF, foramen for fiftb nerve. 



The cranial portion of the skull is a somewhat conical 

 box of bone, the base of which forms the hinder end 

 of the skull, the apex being directed forwards. In 

 the young skuU the outlines of the component bones 



