Xxi.; Guignard, Sur las anthrozoides et la double copulation sexuelle chez les vbgtaux angiospermes, Comptes rendus (1899), 128; Flaberlandt, Physiologische PJlanzenanatomie (Leipzig, 1909); Die Lichtsinnesorgane der Laubbldtter (Leipzig, 1905); R.
(Chlamydomonadidae).Copulation of two liberated microgonidia.
There are thus two female openings, one for copulation, the other for oviposition, as well as a male opening.
In this duct and sac the spermatophores received in copulation from another snail are lodged.
It is supposed to act in some way as a stimulant in copulation, but possibly has to do with the calcareous covering of the egg-capsule.
Spermatheca or receptacle of the sperm in copulation, opening into the female duct.
In its simplest form this is a hollow flask-shaped horny piece, consisting of a dilated basal portion and a terminal spiniform portion with an orifice at the apex; but its structure is frequently complicated by accessory processes and outgrowths which aid copulation and serve to protect the delicate point from injury.
The male, however, is a veritable pigmy beside the female, and during copulation presents the appearance of a parasite attached to her abdomen.
It will be seen that each type depends upon a specific radical or atom, and the copulation of this character with any hydrocarbon radical (open or cyclic) gives origin to a compound of the same class.
In Cephalopods and the majority of Gastropods copulation occurs.