THE DEVELOPMENT OF THE SPERMATOZOA. 431 
testicular epithelium, in which the true testis cells are sup- 
ported by interstitial cells. One of these testis cells divides 
tangentially, giving rise to two cells which are held together 
by a common plasma; the cell next the lumen of the tube 
grows and the nucleus multiplies, giving rise to several (8— 
12, according to v. Ebner) nuclei embedded in a plasma; 
or, according to Meyer, the cell and its nucleus may pro- 
ceed to form a single spermatozoon without multiplication. 
These nuclei form the heads of the spermatozoa, and the 
plasma the tails. When nearly mature the young sperma- 
tozoa are supported on the plasma, but when they are ripe 
they are cast off from it and enter the lumen of the tube. 
After the spermatozoa have left it this body itself is thrown 
off with its nucleus, which has remained at its base, and 
undergoes fatty degeneration, being found in the lumen of 
the tube in this state. 
For convenience I append a list of synonyms which are 
used by various authors in describing the process of sper- 
matogenesis. 
1. Spermatospore = Spermatogone (St. George, Meyer). 
la. Spermatocyte, intermediate form (St. George). 
2. Sperm-polyblast = Blischen (Kolliker), consisting of the following : 
3. Spermatoblasts = Spermatoblasts of Semper, Klein, Sertoli, or Samen- 
sprossen or Spermatogemme (St. George, Meyer). 
4, Mature spermatozoa, united into bundles by blastophoral cells (sperma- 
toblasts, v. Ebner). Samenahren (Meyer). 
5. Spermblastophor = Deckzellen of Semper. 
. Testicular epithelium = Ursamenzellen (St. George). 
. Interstitial cells = Follikelzellen (St. George, Meyer). 
No 
