JO 



yei;teerate animals. 



tiliaii are the teetli loilged in distinct sockets. The eyes are mostly 

 furnished with movable eyelids. The integument is usually fur- 

 uislied with liornv overlapjiing scales, like those of the Snakes 

 (tig. 105). 



As a general rule the animals included under this head have 

 four well-developed legs, and would therefore be pcijjularly called 

 " Lizards." Some of them, however, such as the common Blind- 

 worm (Aiigids fragiUs) of our own country, exhibit no external 

 inilications of limbs, and would therefore be generally regarded as 

 Snakes. These snake-like Lizjirds, however, can be distinguished 

 from the true Ophidians by the consolidation of the bones of the 



Fi-. 1 



ivnnii {Amjiiisfn'O'iVis) (Afti-r Bell.) 



head and jaws, and by the fact that the eyes are generally ])rovided 

 with niuvable eyelids. Dissertio)! also .shows that the shoidder- 

 girdle (or sc.-ipular .-ircli ) is alw;iys present in a rudimentary 

 condition. 



Pew Lizards .-ne natives of liritidn ; the fudy tonus which can be 

 said to be at .-dl ,-d)Und,nit lieiiig the Llind-wiiiin or Slow-worm and 

 the Sand-lizaril (Ar^v/'/ir nr/i/ix). Of (lie sn.ike-like Lizards, a good 

 example is to lie fnuud in the cnunuun IJlind-wonn <ir Slow-worm 

 of E\u-o)je. It is couijiletely ser|ientiform, without any external iu- 

 ilii'ations of limbs (tig. IDo), and it is quite harmles.s. It is remark- 

 alilr for tlir f.'icl, that, wlieu alarmed, it stitfens its muscles to such 

 ail cAtriii tli.it I'a' tail cm readily be broken olt, as if it were brittle. 



