INTERNAL ANATOMY OF INSECTS. 13 
is less in the zmago than in the Jarva. With regard to 
the distribution of these knots to the different primary 
parts of the body, the following table will exhibit it, as 
far as I am acquainted with it, at one view. I omit those 
in which the ganglions are only in one of these parts. 
, Head. Trunk. Abdomen. 
Merida ovridissi mi? i. ii Wii odoecee By terewns de OF 
Flydrophilus'piceus cece 1 seccsceee G veveesees 2 
Clubiona atrot  .....006. O iit 2ieweeuesme val 
Gryllotatpa walparis . L560 tise seeder Bi rewst ecm 72 
Myrmeleon Larva osveee O ververses 2 vovveecee 8° 
MOPS TeNae ssccetree Ol seseoeces ON ceseeq so 
Apistdomestict. iiicctectes (OM snsiethiese) B veayretscess 4 
Ephemera: Larva s..veccse OF sedsavses Bi sssveseeeF 
PR shniae Dar0a B50. Rs NOL ve vedsid C'selhoudscers 7 
3. I am next to say a few words upon the shape of the 
ganglions. Most commonly it approaches toa spherical 
figure, but in many instances, as I said before, they, as 
well as the brain, consist of two lobes: they are, however, 
seldom ajl precisely of the same shape. In the Dytiscz, 
and Carabi, the last is marked with a transverse furrow, 
which seems to indicate the reunion of two®; in the stag- 
beetle, the first ganglion is oval or elliptical, the second 
hexagonal; the third and fourth shaped like a crescent, 
and the last like an olive‘; in the caterpillar of the great 
goat-moth the first is oblong and constricted in the mid- 
dle, and the seven last are rhomboidal£; in the great 
Hydrophilus the second, and in the silk-worm all the gan- 
* Cuv. ubi supr. 343—. b Ibid. 345. © [bid. 325—. 
@ Tbid. 351. © Tbid. 339. £ Tbid. 335—. 
® Lyonnet Anat. 190. 
