spermist

from The Century Dictionary.

• noun One who holds the theory of spermism or spermatism; an animalculist: the opposite of ovulist. See theory of incasement, under incasement. Also spermatist.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Biol.) A believer in the doctrine, formerly current, of encasement in the male (see encasement), in which the seminal thread, or spermatozoid, was considered as the real animal germ, the head being the true animal head and the tail the body.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun historical One who believed that the complete human being was contained in the sperm rather than the ovum.