OHAPTEE III. 



The Order of Lizards. — Sauriaxs. 



This is tlie second order of the great section of Scaly Reptiles 

 {Squamata), as distinguished from the Shielded Reptiles {Cata- 

 pkracfa). The name Saurian, Saupos, given by Aristotle to the genus 

 of Lizards, has heen more comprehensively applied to a group 

 of Reptiles which have the body elongated, covered v^ith scales, or 

 having the skiu rough like shagreen. They have, for the most 

 part, four feet, the toes of which are furnished with hooked claws ; 

 their eyelids are movable, and their jaws armed with encased 

 teeth ; they have a distinct tympanvim, a heart with two auricles 

 and a single ventricle, sometimes partially valved, having sides and 

 a sternum. They are not subject to metamorphosis, and, finally, 

 they are furnished with a tail. 



["By far the greater number of the Saurians," writes Dr. 

 Giinther, " are easily distinguished from the other orders of 

 reptiles by their elongated form, by their movable thorax covered 

 with skin, by the presence of legs, and by their general integu- 

 ments, which are either folded into scales, or granular, or 

 tubercular, or shielded ; still, there are many Saurians which, at 

 a superficial glance, might easily be taken for members of the 

 preceding order — that of the Snakes ; and it cannot be denied 

 that there is a gradual transition from one of these orders to the 

 other. On the part of the Saurians, we allude to those which 

 have no externally visible limbs, and which combine with a 

 greatly elongate, cylindrical body, the peculiar kind of locomo- 

 tion we observe in Snakes. Yet the greater affinity of these 

 reptiles to the ordinarj' Lizards is indicated by another character, 

 which is in intimate connection with their mode of life. The 



