Eggs deposited in a cocoon after copulation.
It is probable that they acquire special sensibility at the breeding season and serve as " guides " in copulation.
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.
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.