Spe 206 



Spermatheca. The outer covering membrane of 

 tlie spermatozoa. (Gr. sperma, and theca.) 



Spermatoblasts, Spermatids. — Sperm-cells formed 

 by the spermatocytes dividing into two and 

 then four. (Gr. sperma, and hlastos, a bud.) 



Spermatocysts. — The hollow globes formed by the 

 spermatospores dividing. (Gr. sperma, and 

 Jcystis, a bladder.) 



Spermatocytes. — The sperm mother-cells lying in 

 the spermatocysts. (Gr. sperma and hystis). 



Spermatogonium. — The primordial germ cell from 

 which the spermatozoa arise and which contains 

 a large and pale nucleus and a dark body (the 

 accessory nucleus of Butschli). The sperma- 

 togonia (spermatospores) are converted into 

 spermatocysts, which divide into spermatocytes, 

 these last divide and form the sijermatids which 

 directly transform into spermatozoon or sperma- 

 tozoa. 



Spermatospores. — Germinal cells lining the 

 chambers of the testes. (Gr. sperma, and 

 sporos, a spore.) 



Spermatozoa. — The active sperm-cells formed by 

 the spermatids escaping through the split wall 

 of the spermatocyst. (Gr. sperma, seed, and 

 zoa, animals.) See Spermatozoon. 



Spermatozoon. — A single, small, active, male 

 sperm-cell. (Gr. sperma and zoon.) 



Sphaericum. — Spherical. (L. spJiaera, a round 

 body, sphere, etc.) See Globose. 



