32 PHYSIOLOGICAL SERIES. 



a bilobed cerebral ganglion of relatively uncomplicated 

 structure, and of a chain of 22 transversely concentrated 

 post-oral ganglia, united to one another by transversely 

 separate connectives. The cerebral ganglion (fig. 15) is 

 composed of two pyriform lobes on either side, situated one 

 above the other with their long axes at right angles. 

 The dorsal pair are set transversely to the a\i- of 

 the body, and give off' from their pointed outer ends a 

 bundle of optic nerves. The ventral pair innervate the 

 antenme; they lie slightly in advance of the dorsal lobes 



Fig. 1/i. 



JC A.L. 



V.N: 



The Brain of Scolopcndra morsitatis, after St. Remy (Ventral aspect). 

 A.L. Antennary lobes. O.L. Optic lobes. V.N. Visceral nerves. 



with their axes longitudinal. In front they are continued 

 into the antennary nerves, and behind into the circmn- 

 oesophageal connectives, (ilomernlated condensation- occur 

 in their neuropile similar to those found in the antennarv 

 lobes of other Arthropods, :m( ] from their posterior parts 

 nerves are given off to the viscera. The subu'soph:ireal 

 jranjjlion is larger than the rest of those in the ventral 

 chain ; it innervate the jaws and other month appendages. 

 The succeeding 21 ganglia are nmilar to one another. 

 They are arranged segmentally, and each gives off four 

 pairs of nerves one to the limbs and the rest to the body- 

 wall and trachea) of the same segment. 



