l'2t INTERNAL ANATOMY OF INSECTS. 
tube; in the above insect there are six pairs, three in the 
trunk and three in the abdomen, and in S. Europmis a 
smaller number* ; these vessels run transversely from the 
liver, or aggregation of conglomerate glands, to the intes- 
tinal canal b ; the bunehes 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 c . 
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 s ; 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 1 '; the 
rectum is rather tumid, and has a lateral ccccum '. The 
disposition of the liver or conglomerate glands is stated 
to be similar to that of the scorpion k ; it is usually white, 
a Treviranus, Ibid. v. 
b N. Diet. d'Hist. Nat. xxx. 421—. Comp. Trcviran. Ibid. 
c N. Diet. d'Hist. Nat. Ibid. 
■J Treviran. Ibid. t. If. 6. i i, cc. e N. Diet. d'Hist. Nat. Ibid. 
' Treviran. Ibid. t. M.f. 24. a. g Ibid, v, b. 
h Ibid. c,d,f. > Ibid. s , n. k N. Did. d'Hist. Nat. Ibid. 
