Somatoplasma-plasm.—See p. 32.
Specialized congenital characters.—See p. 65.
Spermathecae.—Organs for the storing of the seminal fluid received in copulation.
Spermatogenesis.—The precise development of spermatozoa.
Spermatozoa.—The essential elements in the male seminal fluid, and secreted by the testis—the male reproductive gland.
Stirp (Gallon).—See p. 58.
Telegony.—See p. 141.
Unicellular Organisms.—Organisms composed of a single cell only, as distinguished from those consisting of aggregations of cells—Multicellular organisms.
Vertebrata.—Animals with a backbone and a ventral heart.
Vestigial Organs.—See Rudimentary organs,