NERVE SYSTEM. 



53 



stance, whiter and more solid, possibly corresponding 

 to the so-called white matter of the brains of verte- 

 brate animals. The general form taken is seen from 

 B, which covers over, but still so as to allow to 

 appear, the so-called pedunculated bodies of Dujardin, 

 and is copied from an actual brain, compared with 

 the drawing given by that physiologist, in his admir- 

 able Memoir.* When these bodies are freed from 

 their surroundings, they are seen to bear a very 



a ^^ a 



Fig. 12.— The Brain, or Supra-cesophageal Ganglion. 



A, Head, showing Brain, &c, magnified ten times— o, o, o, Ocelli; a, a. Antennae, 

 with Nerves ; p, p. Brain covering Pedunculated Bodies ; og, og, Optic Ganglion ; 

 s, Sub-eesophageal Ganglion. B, Supra-cesophageal Ganglion, or Brain,, 

 deprived of External Membranes, magnified thirty times. 



short peduncle, or stalk, pointing towards, and nearly 

 reaching, the median line ; so that, although they do 

 not actually touch, they possibly bring the two 

 lateral halves of the brain into relation. These 

 stalks bear above them the convoluted lobes. A 

 granulous tubercle, placed in front of each of these 

 singular forms, and prominent in the ant as well as 

 the bee, is supposed by Dujardin to be especially 



1 Annales des Sciences Naturelles," 3me S^rie, vol. xiv. 



