145 INTERNAL ANATOMY OF INSECTS. 
II. The Oviduct (Oviductus) 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 *, 
is distinct, and lies between the sexual organ and the 
the anus. In the Arachnida there are two oviducts?. 
IIL. 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 Judide, in which there is only a 
single ovary, the oviduct at its upper or inner extremity 
terminates in ¢wo 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 
single membrane, and are joined to the oviduct by mem- 
branous rugose cloace’: in the Phalangia, however, 
there are twotunics; the outer one of a cellular substance, 
and the inner one consisting of spiral fibres like trachee 
—a kind of structure which renders them capable of great 
ion 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. 
* Herold Schmett. t. iv. f. 2. m n. 
> Treviran. Arachnid. 36. ¢. iv. f. 32. aa. Marcel de Serres in 
Mem. du Mus. 1819, 89, 
© Marcel de Serres, Afem. du Mus. 1819. 115. 
4 Rifferschw. De Genital. Ins. 1}. 
