48 SPERMATIC PARTICLES. 



Explanation of the Plate. 



Fig. 1-5. Platessa Flesiis ; Fig. 1, nucleolated sperm-cells in testicular cells; fig. 2, the same segmented ; 



fif. 3, increased to the maximum and e.xtensively segmented ; fig. 4, spermatic particles in testicular cell ; 



fig. 5, free spermatic particles. 

 Fig. 6-11. Leucisctis chrysokucas ; fig. 6, nucleolated sperm-cells ; fig. 7, nucleus singly segmented ; fig. 8, 



nucleus doubly segmented ; fig. 9, e.xtensive segmentation ; fig. 10, free spermatic panicles in parent 



cells, the tail most distinctly seen ; fig. 11, free spermatic particles, the tail excessively minute. 

 Fig. 12-21. Rana pipiens ; fig. 12, spermatic ovules, with nucleus as a vitellus ; fig. 13, vitellus dividing 



and divided ; fig. 14, each still dividing, so as to make four ; fig. 15, still further fissuration, so that there 



are eight and si.xteen segments; fig. 16, spermatic particles formed in parent cells in fasciculi ; fig. 17, 



spermatic particles formed in parent cells, scattered ; fig. 18, spermatic particles without tails ; fig. 19, 



spermatic particles with tails ; fig. 20, spermatic panicles cur\ed like a hoop, no tail ; fig. 21, moving, 



slightly caudate cells, in the field, probably escaped spermatic cells. 

 Fi". 22-28. Columba livia; fig. 22, nucleolated sperm-cells; fig. 23, nucleus divided and subdivided; 



fiff. 24 and 25, still further segmented ; fig. 26, free spermatic particles among granules in sperm-cells ; 



fig. 27, spermatic particles in a fasciculus ; fig. 28, free spermatic particles. 

 Fi". 29 - 35. Mus decumanits ; fig. 29, nucleolated sperm-cells ; fig. 30, the same increased in size with 



nucleus singly segmented ; fig. 31, doubly segmented ; fig. 32, segmentation more and more extensive ; 



ficr. 33, eight spermatic panicles in sperm-cell ; fig. 34, four spermatic panicles in sperm-cell ; — in 



both cases they have probably been developed out of or in cells, and assumed this disposition from 



convenience ; fig. 35, free sickle-shaped spermatic particles. 

 Fig. 36 - 41. Sciurus hudsonicus ; fig. 36, nucleolated sperm-cells ; fig. 37, singly segmented ; fig. 38, doubly 



segmented ; fig. 39, e.xtensive segmentation ; fig. 40, spermatic particles with thin, broad, disk-like anterior 



e.xtremity, containing granules ; fig. 41, the same seen sideways to show the thinness. 

 Fig. 42-48. Ovis aries ; fig. 42, nucleolated sperm-cells; fig. 43, the same described; fig. 44 and 45, still 



further segmented ; fig. 46, spermatic particles free in sperm-cells ; fig. 47, spermatic panicles in a 



fasciculus in sperm-cell ; fig. 48, free spermatic particles. 



