i18 INTERNAL ANATOMY OF INSECTS. 
there issue two pairs of very slender tortuous ones, sceim- 
ingly analogous to the common bile-vessels; one pair of 
which runs upwards, one on each side that organ to- 
wards the mouth, forming here and there some ramifi- 
cations which enter the liver; and the other runs nearly 
transversely to it?. As the fluid contained in these ves- 
sels is different from that contained in the glands of the 
liver, M. Marcel de Serres supposes they may be chyli- 
ferous?. 
In the Arancideé also the alimentary canal is nearly 
straight, and scarcely exceeds the length of the body: 
the gullet is rather thick and cylindrical‘: 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®; the 
rectum is rather tumid, and has a lateral cecum‘. The 
disposition of the liver or conglomerate glands is stated 
to be similar to that of the scorpion; it is usually white, 
but in some species it is yellowish or reddish, and its 
lower surface has sometimes regular excavations"; no 
transverse hepatic ducts connecting it with the alimentary 
canal, as in the scorpion, appear to have been at present 
discovered: two pairs of capillary free vessels are at- 
tached to the base of the sectum on one side, which, ex- 
cept in their situation, seem analogous to the bile-vessels 
of insects '. : 
* Treviran. Ibid, t. i. f. 6.0, ec. » N. Dict. d Hist. Nat. Ibid. 
* Treviran. Ibid. t. ti. f. 24. a. = [bid 20, 0. 
© Did ead ate f Ibid. g, 2. ° ON. Dict. @ Hist. Nat. Ibid. 
» Treviran, Ibid. 28, ' Ibid. t. ii. f. 24, B, 
