MYOLOGY OF REPTILES. 



229 



dibular attachment over the articular capsule to the back part of 

 the angular process, protracts the lower jaw. 



The entopterygoideus, fig. 145, k, is attached anteriorly to the 

 pterygoid bone, ib. 4, whence its fibres pass outward and back- 

 ward to the inner surface of the angular and surangular elements, 

 covered by the ectopterygoideus. It retracts and divaricates the 

 palato-pterygoid jaws, protracts and approximates the back parts 

 of the mandibular rami. The fore parts of those bones which, 

 through their loose elastic symphysial connection, yield laterally to 

 the pressure of the prey when seized, are brought together, after 

 it is swallowed, by an in- 



termandibidaris, answering ^ 



to 21, fig. 137, in fishes: 

 it is shoAvn in fig. 147, 

 passing from the end of 

 one ramus to that of the 

 other, at v, v, with a me- 

 dian raphe, as in the my- 

 lohyoideus ; and sending a 

 slip v from each attach- 

 ment, which expands upon 

 the intermandibular inte- 

 gument, restoring and cor- 

 rugating it after its great 

 occasional stretching;. In 

 this it is aided by a thin 

 layer of fibres internal to 

 and in close connection 

 with the insertion of the 

 costomandibularis exposed 

 by the outward reflection 

 of that muscle at fig. 

 147, a. 



In Fishes the fore part 

 of the levator tympani, fig. 

 136, 22, is inserted into the 

 pterygoid : in Serpents 

 the origin of the answer- 

 able part, presphenopterygoideus, is advanced forward to the pre- 

 sphenoid, whence its fibres, fig. 146, /, pass outward and backward 

 to their insertion into the pterygoid, 4, and ectopterygoid, 3, at 

 their junction. In protracting the pterygoid it pushes forward 

 the maxillary, rotating it outward in the Constrictors; but, by 



Muscles of the throat of the Rattlesnake. (Crotalus.) oxen 



