126 



gastric has effectually two attachments to the head, 

 one in front and one in the rear of the head con- 

 dyles, so that it is easy to see how the movements 

 of the lungs and of the head are connected by 

 these muscles in harmony with the workings of 

 the 'neck. It is (§ 118) through their medium that 

 the shoulder and hind-limhs are Itrought into connec- 

 tion tvith the hicomposite spine. 



We have (§ 121) referred to some resemblance 

 between the rings of the windpipe and the ribs of 

 the snake combined A\dth its scutae (§44), suppos- 

 ing the vertebrae to be translated to some other 

 position. The ivindpipe seems to act in sufficient 

 correspondence with the vertebrae of the neck to 

 admit of the supposition that it is th£ " artificiaJ 

 ground " on ivhich the neck works in the composite 

 spine, as the ribs do on the sternum, and, by the 

 connection of the abdominal muscles, Hkewise on 

 the pubis. The sternum is joined to the head by 

 the stern o-mastoids, just where the windpipe is 

 joined to the head by the rear portions of the di- 

 gastrics. This fact may somewhat corroborate 

 their similarity of functions. 



The digastrics, when the lower jaw is closed, give 

 the windpipe an attachment to the head, in front 

 of the head-condyles, but the tmnk of the body 



