240 



THE ANATOMY OF VERTEBRATED ANIMALS. 



conspicuous in these, and sundry other, poisonous Snakes. 

 The upper and inner part of the maxilla articulates with a 

 pulleylike surface furnished to it by the lachrymal, so that 

 the maxilla plays freely backwards and forwards upon that 

 bone. The lachrymal, again, has a certain amount of motion 

 upon the frontal. The upper edge of the posterior wall of 

 the maxilla is articulated by a hingelike joint with the 

 anterior end of the transverse bone, which has the form of 

 an extremely elongated and flattened bar connected pos- 

 teriorly with the pterygoid. 



f if?, -i. 



Fig. 74. — A, the skull of Crotalus, viewed from the left side; B, a 

 transverse section taken at the point £ in Fig. A, showing T, the 

 persistent cartilaginous trabeculse. The maxilla is supposed to be 

 transparent, and the anterior half of the palatine bone is seen 

 through it. 



The latter is long and stout, and, as nsual, is united, be- 

 hind, with the distal end of the quadi-ate bone. In front of, 

 and internal to, its union with the transverse it is prolonged 

 forwards, and becomes united, by a moveable joint, with the 

 short palatine bone, which is flattened from side to side, 



