CLASS REPTILIA 



381 



during a period of several days. Three groups of Squamata are usually 

 recognized — chameleons, lizards, and snakes. 



0/fac/ory lobes 



Cerebrum 



Optic lobe 



Cere be f turn 



Fig. 259. — Brain of alligator, Alligator mississippiensis (Daudin), viewed from above. 

 (From a Ziegler model, after Wiedersheim.) The roots of the cranial nerves are marked by 

 roman numerals. 



414. Chameleons. — Some lizards are erroneously called chameleons 

 because of the ease with which they change color. This term, properly 



