GLOSS AKY 447 



[Spermatogem'ma] {(nripfxa, seed; geiiiiiia^ bud), nearly equivalent to spermato- 



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



Valette St. George. 1878.] 

 Spermatogen'esis (airipixa. seed; yeVeo-ts. origin), the phenomena involved in 



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



process of reduction in the male. 

 Spermatogo'iiium (" Ursamenzelle") (o-n-cp/xa, seed: yovr). generation), the 



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

 matogonium typically gives rise to four spermatozoa. (La Valette St. 



George. 1876.) 

 Spermatome'rites (o-rrepfjui, seed; fxepo<;. a part), the chromatin-granules into 



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



Petroinyzon, Bohm. 1887.) 

 Sper'matosome (a-n-epfjui, seed; o-w/Aa, body), the same as spermatozoon. (La 



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. 

 Spermatozo'on (o-Tre'/a/xa, seed; ^wov, animal), the paternal germ-cell of animals. 



(Leeuwenhoek. 1677.) 

 Sperm-nucleus, the nucleus of the spermatozoon ; more especially applied 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. Hertwig, 



1875.) 

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

 Spi'reme ((TiT€Lp-qp.a, a thing wound or coiled; a skein), the skein or " Knauer' 



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



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

 Spon'gioplasm (airoyyiov, a sponge; TrXda/xa, a thing formed), the cytoreticulum. 



(Leydig, 1885. ) 

 Ste'reoplasm (o-reped?, solid), the more solid part of protoplasm as opposed to the 



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

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



(Levdig, 1885.) 

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

 ■ 1885.) _ ^ 



Synap'sis (avvaTTTw, to fuse together). A stage in the nucleus precedmg the hrst 



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 (re'Aos, end; (SXaaro^, 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 (rcXo?, end ; Xcki^os. yolk), that type of ovum in which the yolk is 



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

 Te'lopliases, Telokine'sis (reXos, end), the closing phases of mitosis, during 



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

 To'noplasts (tovo's, tension ; TrAao-ro's, form), plastids from which arise the vacuoles 



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

 Trophoplasm (rpocfy^. nourishment; irXdapa). i. The nutritive or vegetative 



substance of the cell, as distinguished from the idioplasm. (Nageli. 1884.) 



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



plasm. (Strasburger. 1892.) 

 Tro'phoplasts (rpoc^Tj, nourishment ; TrXao-rds, form), a general term, nearly equiv- 



