MYOLOGY OF REPTILES. 



229 



dilnilar attachment over tlie articular capsule to the back part of 

 the angular process, protracts the lower jaw. 



The entopteryfioideus, 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 suranffular elements, 

 covered by the ectopterygoideus. It retracts and divaricates the 

 palato-pterygiiid jaws, protracts and approximates the back j)arts 

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

 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- 

 ter inandlhularis, answering ^*^ 

 to 21, fig. 137, in fishes: 

 it is shown 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, restorino; and cor- 

 rugating it after its great 

 occasional stretching. In 

 this it Is aided Ijy a thin 

 layer of fibres internal to 

 and in close connection 

 with the insertion of the 

 costomandibularis expiosed 

 l)y 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 oris'in of the answer- 



o 



able part, presphenopteri/f/oiJeu.^, is advanced forward to the pre- 

 sphenoid, whence its fi)>res, fig. 146, /, pass outward and backward 

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

 their junction. In jirotracting the pterygoid it pushes forward 

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



■It fit the l;atMcsuakf. iCmlahn:.) cxcil 



