THE BRAIN. 507 
és 6 
‘3 
Fig. 355. 
Fic. 352.—Nervous system of a white ant, Termes ‘after Gegenbaur and Lespés). 
Fig. 358.—Nervous system of a water beetle, Dytiscus (after Gegenbaur). 
Fie. 354.—Nervous system of a fly, Musca (after Gegenbaur and Blanchard). 0. eyes; gs, 
supra-cesophageal ganglia or brain; gi, sub-cesophageal ganglion; gr, gr?, gr?, fus 
thoracic ganglia. 2 ‘ : 
Fie. 355.—Nervous system of a crab, Palinurus vulgaris, showing considerable fusion of 
ganglia (after Milne-Edwards). a, fused cerebral ganglia ; b, b, long cesophageal cords ; 
¢, c, great ventral ganglionic mass. 
Fig. 356.—Nervous system of a large scorpion-like spider, Thelyphonus caudatus (after Ge en- 
eter ad ard). s, cerebral ganglia ; i, great ventral ganglion ; 0, eyes; p, palpi; 
D'-p", feet. y 
