424' Dr. KitUl on the Anutojuy 



in contact with tlie common integuments, that great care is 

 requisite, lest in i-emoving these integuments the nerves them- 

 selves should be removed, or at least injured. The first of 

 these ganglions, reckoning from the anal extremity of the ab- 

 domen, is globular in its form ; and is situated between the in- 

 testine and the sexual organs, the latter being placed imme- 

 diately under the ventral integuments. This ganglion gives off 

 several pairs of nerves, of which by far the largest pair may be 

 traced into the caudal antennae. Tlie second, third, and fointh 

 ganglions are smaller than the first, and are of an oval rather 

 than a globular form : they each send out from two to four 

 or five pairs of nerves. The fifth and sixth ganglions (of which 

 the former is the smallest, the latter the largest ganglion, of 

 the whole series) are situated so closely together, that it is not 

 always easy to demonstrate the connecting medullary cords. 

 The sixth ganglion, which from its size and the number of 

 nerves radiating from it might be called the solar ganglion, is 

 situated between the roots of the posterior legs. The seventh 

 and eighth ganglions are situated respectively between the 

 roots of the middle and the fore legs. 



From the eighth ganglion, which lies under the furcular 

 bone of the sternum, two parallel medullary cords pass on to 

 the root of the mandibles, where they unite with the ninth and 

 last ganglion, which is situated under and in contact with the 

 commencement of the oesophagus. This ganglion, which is 

 hollow, as perhaps all the others may be, sends off nerves to 

 the maxilla and adjacent parts : and it sends off besides, two 

 large and important branches which ascending on each side of 

 the oesophagus unite with two corres]5onding branches that de- 

 scend from the brain ; which organ is situated immediately in 

 contact with the commencement of the oesophagus on its upper 

 surface : so that the oesophagus is placed between the ninth 

 ganglion on its lower surface, and the brain on its upper sur- 

 face, their connecting branches completing the nervous collar 

 which surrounds it at this part. 



The brain differs in colour from the ganglions, being of a 

 pale brownish pink, instead of a cream-colour ; and in size it 

 far exceeds the largest of the oanolions. It consists of two 

 hemispheres, separated by a fissure, from each of which pass 

 out four processes. The first of these processes unites, as above 

 described, with a process from the ninth ganglion, to form the 

 nervous collar of the oesophagus ; the second passes to the root 

 of the antenna ; the third, which may be called the optic nerve, 

 passes towards the inner surface of the cornea, and at its ex- 

 tremity swells out into a fringed coronet of an orange-red co- 

 lour; the fourth pi'ocess, the extremity of which is also of an 



OKUlgC- 



