INTERNAL ANATOMY OF INSECTS. 133 



X 



V 



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 (Carysterium). 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-secreior (loterium). 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 



9 Heroic! Ibid. x. t. iv./. l._p, u } y. Marcel de Serres Mem. du 



Mus. 1819. 141. b Gaede Anat. t. If. 3. d. 



, c Ibid. 17. t. i./. 4. d Bibl. Nat. t. xix./. 3. /3. 

 e Reaum. v. 377. t. xxix./. 7. s. 



f N. Diet. d'Hisl, Nat. xxx. 388, ' Ibid. 427. 



