INTERNAL ANATOMY OF INSECTS. 13 



seven in the hive-bee and some Lepidoptera a ; eight in the 

 grub of the stag-beetle b ; nine in the great Hydrophilm c ; 

 ten in Dytiscus d , eleven in the grub of the great Hydro- 

 philus % twelve in the grub of Dytiscus and the caterpil- 

 lars of Lepidoptera f ; thirteen in the larva of JEshna & ; 

 and twenty-four in Scolopendra morsitans h . You must 

 observe that, generally speaking, the number of ganglions 

 is less in the imago than in the larva. 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. 



3. I am next to say a few words upon the shape of the 

 ganglions. Most commonly it approaches to a spherical 

 figure, but in many instances, as I said before, they, as 



a Cuv. ubl supr. 348. b Ibid. 320. c Ibid. 340. 



Ibid. 338 . e Gaede ubl supr. 



* Cuv. ubisupr. 323. 327. Mr. Bauer (Phil. Trans. 1824. .ii. 

 /. l.)has figured only seven, excluding the brain, in that of the silk- 

 worm, and Malpighi (De Bombyc. t. vi. f. 2.) ten, Swammerdam 

 (Bibl. Nat. t. xxviii./. 3.) however has twelve. 



Ibid. 326. h Ibid. 352. } Ibid. 343. 



k Ibid. 345. ' Ibid. 325 m Ibid. 351. 



