151 INTERNAL ANATOMY OF INSECTS. 
in these cases the eggs are fertilized in their transit 
through the oviduct by sperm adhering to the folds of 
the cloaca: 3 : but this opinion seems less analogous to 
what takes place in other cases, with regard to the due 
preparation of the eggs for a safe and effectual transit b . 
II. The Oviduct (Oviduclus) is the canal, always se- 
parate from the vagina, which receives the eggs from the 
ovary, transmitting them, often by a peculiar and com- 
plex instrument in which it terminates, to their proper 
station. This canal sometimes opens into the anal pass- 
age or cloaca, and at others, as in the cabbage-butterfly c , 
is distinct, and lies between the sexual organ and the 
anus. In the Arachnida there are two oviducts d . 
III. The Ovaries (Ovaria) in insects are the viscera 
in which the eggs are generated and grow till they ar- 
rive at maturity, when they pass through the oviduct, 
and are extruded or deposited in their appropriate sta- 
tion. They vary considerably in their structure. In all 
however, except the Iulidcc, in which there is only a 
single ovary % the oviduct at its upper or inner extremity 
terminates in two branches, usually further subdivided 
into a number of smaller conical ones, which several ra- 
mifications constitute the ovaries, or egg-tubes as they 
are sometimes called : these tubes generally consist of a 
* De Insector. Genital, 1 7. 
b I allude to those organs above described (p. 132.) for the secre- 
tion of matter for varnishing the eggs or lubricating the oviduct. It 
seems most probable, if the fecundation of the eggs takes place gra- 
dually, that upon their passing into the oviduct, a special reservoir 
should be appropriated to the reception of the male sperm, adapted to 
maintaining in due activity the vivifying principle, or aura seminalis. 
c IJerold Schmeit. t. iv.f. 2. m n. ri Treviran. Arachnid. 36. 
/. iv./. 32. aa. Marcel de Serres in Mem. du Mus. 181i>. 89. 
e Marcel dc Scries, Mem. du Mus. 1810. 115, 
