INTERNAL ANATOMY OF INSECTS. 



tube ; iii the above insect there are six pairs, three in the 

 trunk and three in the abdomen, and in S. Europ<zus a 

 smaller number a ; these vessels run transversely from the 

 liver, or aggregation of conglomerate glands, to the intes- 

 tinal canal b ; the bunches consist of an infinite number 

 of spherical glands, generally filled with a brown thick 

 fluid c : besides the transverse vessels, from the base of 

 the stomach there issue two pairs of very slender tortu- 

 ous ones, seemingly analogous to the common bile- 

 vessels ; one pair of which runs upwards, one on each 

 side that organ towards the mouth, forming here and 

 there some ramifications which enter the liver ; and the 

 other runs nearly transversely to it d . As the fluid con- 

 tained in these vessels is different from that contained in 

 the glands of the liver, M. Marcel de Serres supposes 

 they may be chyliferous e . 



In the Araneidea also the alimentary canal is nearly 

 straight, and scarcely exceeds the length of the body : 

 the gullet is rather thick and cylindrical f ; the stomach 

 is distinguished anteriorly by two pairs of sacs, the 

 upper pair being much the largest and nearly triangu- 

 lar, the lower linear * ; from these sacs a narrow tube 

 runs towards the rectum, but which is so entangled with 

 the liver, muscles, &c., as not to be easily made out h ; the 

 rectum is rather tumid, and has a lateral ccecum '. The 

 disposition of the liver or conglomerate glands is stated 

 to be similar to that of the scorpion k ; it is usually white, 



Treviranus, Ibid. v. 



N. Diet. d'Hist. Nat. xxx. 421. Comp. Treviran. Ibid. 

 N. Diet. d'Hist. Nat. Ibid. 



Treviran. Ibid. t. i. /. 6. i i, c c. e N. Diet. d'Hist. Nat. Ibid. 



Treviran. Ibid. t. \\.f. 24. a. * Ibid, v, b. 



h Ibid, c, d,f. Ibid, g t n. k N. Did. d'Hist. Nat. Ibid. 



