igS ZOOTOMY. 



bones; a stout irregular articular (ar), furnishing the 

 articular cavity for the quadrate, and continued forwards 

 into a slender Meckel's cartilage ; a splint-like bone, the 

 angular (an), covering the ventral edge of the articular 

 and Meckel's cartilage; and the supra-angular (s.an) 

 similarly related to their upper edge. 



75. From the inner face of the distal portion of each 

 ramus a thin splint, the splenial, can be separated even 

 in the adult : the remainder of the distal portion is the 

 dentary {d), 



X. Observe in the hyoidean apparatus : 



76. The body of the hyoid, consisting of three distinct 

 portions : the first or glosso-hyal, is cartilaginous and 

 arrowhead-shaped, the second or basi-hyal, is a short 

 stout bone, articulating in front with the glosso-hyal, and 

 behind separated by a cartilaginous interval from the third 

 portion or basi-branchial, which consists of a slender 

 bony rod with a free cartilaginous extremity. 



77. The anterior cornua, short, paired, cartilaginous 

 rods, proceeding backwards and outwards from the posterior 

 end of the glosso-hyal, like the barbs of the arrowhead. 



78. The posterior cornua, slender paired rods, spring- 

 ing from the cartilaginous junction between the basi-hyal 

 and basi-branchial, and curving backwards, outwards, and 

 upwards : each consists, iirst, of a proximal or ventral 

 portion, a slender bony rod, the cerato-branchial ; this 

 is connected at its distal end with a similar rod, the epi- 

 branchial, which terminates distally in a slender pointed 

 cartilage. 



XI. Make out the characters of the sternum as 

 follows : 



79. The body or corpus sterni, a horizontal boat- 

 shaped plate of bone, its right and left halves inclined to 



