THE ANATOMY OF THE LIZARDS 23 



worm must be seized by one end. This having been 

 done, in order that deglutition may be accomplished, 

 the lizard must again open its mouth to the end that 

 a further hold may be obtained upon the elongated 

 prey. The mouth being open, were there no provision 

 to prevent it, the squirming worm might regain its 

 freedom. This accident, however, is prevented by the 

 adduction of the previously abducted jaws, which firmly 

 grip that portion of the worm which is contained in the 

 mouth. This process is repeated until the whole of 

 the worm has passed into the oesophagus. The grip 

 by the pterygoid bones is rendered more secure by the 

 pterygoidean teeth when such structures are present." 



Dr. Bradley's most instructive paper is illustrated 

 by a series of original drawings of the muscles 

 and articulations concerned in the movements dis- 

 cussed. 



Apart from the jaws, the lizards — or some of them 

 — exhibit some striking anatomical contrasts among 

 each other in the matter of limbs, and in the function 

 of locomotion. This subject is dealt with later in 

 a separate chapter in connection with the limbless 

 slow-worm. 



