We cannot always or often procure from the poor patient recent semen, and of course are deprived of the test of zoospermatic movements.
J. Bell in J. Bell & W. Stokes, Lect. Theory & Pract. Physic (ed. 3) vol. I. lxvi. 691
1879
The presence of corpuscles of a zoospermatic nature in Spongilla appeared..to establish as an assured fact the existence of a sexual differentiation in the sponges.