GLOSSARY 



447 



[Spermatogem'ma] (cr7rep/xa, seed; geniuia. bud), nearly equivalent to spermatn- 

 cyst. Differs in the absence of a surrounding membrane. [In mammals. La 

 Valette St. Georcje. 1878.] 



Spermatogen'esis {air^pfxa, seed; yeVcmi;. origin), the phenomena involved in 

 the formation of the spermatozoon. Often used more specifically to denote the 

 process of reduction in the male. 



Spermatogo'nium ("• Ursamenzelle'') (rr7rep/xa, seed; yovy. generation), the 

 descendants of the primordial germ-cells in the male. Kach ultimate sper- 

 matogonium typically gives rise to four spermatozoa. (La \'ai.f:ite St. 

 George, 1876.) 



Sperniatome'rites {cnripixa, seed; /xepos. a part), the chromatin-granules into 

 which the sperm-nucleus resolves itself after entrance of the spermatozoon. (In 

 Petrojnyzo7i, Bohm, 1887.) 



Sper'niatcsome (a-n-epfxa, seed; crCijxa, body), the same as spermatozoon. (L.\ 

 Valette St. George, 1878.) 



Spermatozo'id (see Spermatozoon), the ciliated paternal germ-cells in plants. 

 The word was first used by von Siebold as synonymous with spermatozoon. 



Spermatozoon (a-rrepfxa, seed ; ^(Joov, animal), the paternal germ-cell of animals. 

 (Leeuwenhoek, 1677.) 



Sperm-nucleus, the nucleus of the spermatozoon ; more especially apjilied to it after 

 entrance into the egg before its union with the egg-nucleus. In this sense 

 equivalent to the "male pronucleus"' of Van Beneden. (O. Hkktnvk;. 



1875.) 

 Sper'mocentre, the sperm-centrosome during fertilization. (Fol, 1891.) 



Spi'reme {criT^.ip'qjxa, a thing wound or coiled; a skein), the skein or •• Knauel" 

 stage of the nucleus in mitosis, during which the chromatin appears in the form 

 of a thread, continuous or segmented. (Flemmixg, 1882.) 



Spon'gioplasm {(nroyytov, a sponge; TrAaa/xa, a thing formed), the cytoreticulum. 

 (Leydig, 1885.) 



Ste'reoplasm {(TT€.p(.6^, solid), the more solid part of protoplasm as opposed to the 

 more fluid •• hygroplasm.'' (Nageli, 1884.) 



Substantia hyalina, the protoplasmic ground-substance or -hyaloplasm." 

 (Leydig, 1885.) 



Substantia opaca, the protoplasmic reticulum or '-spongioplasm.'' (Leydig, 

 1885.) 



Synap'sis (crvvaTrTui, to fuse together). A stage in the nucleus preceding the first 

 maturation-division, characterized by the massing of the chromatin at one side 

 of the nucleus. From it the chromatin-masses emerge in the reduced number. 

 (Moore, 1895.) 



Te'loblast (reXo^, end ; ^Aao-ro?, a germ), large cells situated at the growing end 

 of the embryo (in annelids, etc.), which bud forth rows of smaller cells. (Whit- 

 man, Wilson, 1887.) 



Telole'cithal {riXo<i, end; AeV-i^o?. yolk), that type of ovum in which the yolk is 

 mainly accumulated in one hemisphere. (Balfour, 1880.) 



Telophases. Telekinesis (re'Ao?, end), the closing phases of mitosis, during 

 which the daughter-nuclei are re-formed. (Heideniiain, 1894.) 



To'noplasts {t6vo^, tension; TrAao-ro?. form), plast ids from which arise the vacuoles 

 in plant-cells. (De Vries, 1885. ) 



Trophoplasm (rpoc^r;, nourishment; 7rAaa-/xa). i. The nutritive or vegetative 

 substance of the cell, as distinguished from the idioplasm. (.\A(iKi.i. 1884.) 

 2. The active substance of the cytoplasm other than the "kinoplasm •" or archo- 

 plasm. (Strasburger, 1892.) 



Tro'phoplasts (rpo<^r/, nourishment ; TrAao-ros. form), a general term, nearly equiv- 



