Development of Neopallium ug 



retina consists of an outgrowth from the brain 

 which terminates in a cup-like receptacle for 

 the dioptric apparatus of the eye. In some 

 reptiles the vestiges of a pair of eyes located 

 on the upper surface of the animal's skull exist 

 in addition to their lateral organs of vision. 

 The auditory sensory organs of many reptiles 

 possess structures which greatly facilitate the 

 transmission of waves of sound to the auditory 

 nerves and brain centres. The .nose of reptiles 

 also consists of an elaborate arrangement of 

 structures adapted to present an extensive sur- 

 face for the growth, and development of sensory 

 organs connected with the olfactory nerves and 

 cerebral centres. 



The flow of energy from the outside world, 

 and from internal sources passing to the central 

 nervous system through the sensory organs of 

 reptiles, has exercised a stimulating effect on 

 the development of their terminal nerve cells 

 and pallial structures, which have thus become 

 more pronounced than those possessed by the 

 two lower classes of vertebrates. 1 The con- 



1 The Nervous System of Vertebrates, by Prof. J. B. Johnston, 

 pp. 257, 314. 



