REPTILIA. 



543 



of legs make their appearance ; and these locomotive organs, be- 

 coming more and more completely developed in other genera, at 



Fig. 242. 



length conduct us from the flexible and apodous Serpents to the 

 strong and four-footed Reptiles which are the types of the Saurian 

 division (fig. 243). The progressive developement of the locomo- 

 tive extremities is not a little curious : even among some of the Ser- 

 pents properly so called, as, for example, in the Anguis fragilis 

 of our own country, the rudiments of these limbs may be detected 

 beneath the skin ; more especially those of the hinder extremity, 

 wherein a little pelvis and femur mav be distinctly recognised, 

 while a minute sternum, clavicle, and scapula indicate the first 

 appearance of the thoracic legs. 



In Bimanes, the lowest of the Saurian genera, two little feet, 

 each provided with four toes, are appended to the framework of the 

 shoulder; and in Seps, which equally possesses the body of a 



