26 LECTURE VII. 



arrived at its state of perfection, appears less than 

 the Tadpole from which it was gradually formed, 

 Nor is this peculiar to the Surinam Frog or Rana 

 paradoxa, but takes place in some of the Euro- 

 pean animals of this genus, which are rather larger 

 in the tadpole state than when first arrived at their 

 perfect form, as in the species called the R. al- 

 liacea or alliaceous Toad, a native of Germany, 

 and some other parts of Europe. 



To the Frogs succeed the Lizard tribe, con- 

 stituting the Linnasan genus Lacerta, and dis^ 

 tinguished by having a lengthened body, four 

 feet, and a tail. The Lizard tribe is extremely 

 numerous, and contains many animals of vast 

 size, as the Crocodiles and Alligators ; and others 

 very small, as the common Newts. For the con- 

 venience of zoological students the genus may be 

 divided into assortments arranged according to 

 the habit or general appearance of the species* 

 First the Crocodiles, distinguished by very large 

 and strong scales. The Guanas, commonly fur- 

 nished with a serrated process along the back, 

 and often by a pouch or flap under the throat. 

 The Cordyles, with serrated or toothed scales. 

 The Lizards emphatically so called, with smooth 



