INTERNAL ANATOMY OF INSECTS. 133 
ters the oviduct above this, filled with a thick white fluid, 
the function of which is, probably, to lubricate the pas- 
sage a . A similar organ is found in Phryganea grandis b . 
iv. Jelly-secretor (Corysterium). This is a remarkable 
organ, related to the preceding, which secretes the jelly 
of Trichoptera, some Diptera, &c. ; this organ in the for- 
mer, at least in Phryganea grandis, is of an irregular 
shape, with four horns or processes c . 
Poison-secretor (Ioteriwn). This organ, which is most 
conspicuous in the Hymenoptera Order, has not received 
much notice, except in the case of the Hive-bee and the 
Scolia : in the former, it is an elliptical membranous 
vesicle or reservoir, furnished at its lower extremity with 
a tube which renders to the sting, and at the other by a 
blind, long, filiform, secretory, vessel, which according to 
Swammerdam divides into two terminal blind branches d , 
though Reaumur could detect but one e ; in this vessel the 
poison is secreted and stored up. In Scolia there are 
two secretory vessels, which enter the reservoir in the 
middle on each side f . In the Scorpion, we learn from 
Marcel de Serres that the poison-secretor is clothed ex- 
ternally with a horny thickish membrane, containing 
two yellowish glands, composed of an infinity of spheri- 
cal glandules, terminating in a canal, enlarged towards 
its base so as to form a reservoir, and leading to the ex- 
tremity of the sting s . Connected by a slender tube with 
each mandible in spiders is a vessel with spiral folds, 
which seems properly to belong to this head — though 
* Herold Ibid. x. t. iv./. l.p, u,y. Marcel de Serres Mem. du 
Mus. 1819. 141. b Gaede Anat. t. i.f. 3. d. 
r Ibid. 17. t. i.f. 4. d Bibl. Nat. t. xix./. 3. /3. 
e Reaum. v. 377. t. xxix./. 7. s. 
1 N. Did. d'Hist. Nat. xxx. 388. « Ibid. 427—. 
