I56 EXPLANATION OF PLATES, III —IV. 
Fig. 30. Chromatin bodies represented in last figure are now collected at centre 
of nucleus. Single nucleolus is seen in centre of these chromatin bodies, 
(ditto). 
Fig. 31. Nucleus in which chromatin granules again separate from one another 
and show appearance of normal resting nucleus. Large nucleolus consist¬ 
ing of small chromatin granules is seen, (ditto). 
Figs. 32-43. Sperm-mother-cells nearly in same stage of development. ( v) “ Ver¬ 
bindungsbrücken ” ; ( c ) extruded nucleolus ; (<?) nucleus of cyste. In fig. 
40 collection of cytomicrosomes ( b) is shown. (Same magnification as 
above.) 
Fig. 4.4. More advanced stage. Chromosomes show ring-like form. (Zeiss, homog. 
imm. 1/12, Oc. 4). 
Fig. 45. Similar stage as above. Each ring broken up into four chromosomes. 
(Same magnification as above.) 
Figs. 46-53. Various stages of first division of sperm-mother-cells. Figs. 46-48 re¬ 
present early stages of division, showing attraction-spheres, oblique 
spindle and “Verbindungsbrücken” (v) ; and in fig. 49 polar and central 
spindles are seen. Stained with Böhmer’s haematoxylin. (Zeiss, 1/12, 
Oc. 4). Figs. 50, 50', 51, 52, spindle stage. Fig. 53 diaster stage of 
the same. Treated with Hermann’s triple staining. (Zeiss, 1/12, Oc. 5 
except fig. 50' which is drawn by Zeiss. 1/12, Oc. 5.) 
Figs. 54-60. Second division of sperm-mother-cells, immediately following last divi¬ 
sion. Figs. 54 and 55, spindle stage. (Zeiss, homog. imm. i/i 2 , Oc. 5). 
Fig. 56, diaster stage of same. (Zeiss, homog. imm. 1/12, Oc. 4). Fig. 
57 shows polar view of diaster stage. (Zeiss, Obj. i/x 3 , Oc. 5). Fig. 
58, side viw of same. (Magnif. as above). Fig. 59, little more advanc¬ 
ed stage. Central and polar spindles have separated from each other, 
(magnified as above). Fig. 60, more advanced stage of same, showing 
two cell-plates; ( k) nucleus. (Zeiss, Obj. 1/12, Oc. 4). Those shown 
in figs. 54, 55, 56 stained with Hermann’s triple staining while rest are 
treated with Böhmer’s haematoxylin. 
Figs. 61-83. Various stages of metamorphosis of sperm-daughter-cells. Figs. 6r, 
62, a, b show sperm-daughter-cells with remnant of spindle fibre and 
collected mirosomes (m). (Zeiss, Obj. 1/12, Oc. 4. and 5). Stained with 
Böhmer’s haematoxylin. Fig. 62 c, d represent more advanced stage of 
the same, showing “Nebenkern” (n). Treated and magnified as above. 
In figs. 63 and 64, cell-body is little elongated to form tail of sperma¬ 
tozoon; (k) nucleus (») “ Nebenkern ” (ni) mitosome are shown. Acetic 
acid methyl green preparation and magnified by Zeiss, Obj. J, Oc. 4. 
Figs. 65-78,74-76, 78-81 show head and “ Nebenkern,” of spermatozoa 
showing successive stages of metamorphosis. (/£) nucleus, (») “ Neben- 
kern,” (m) mitosome. Böhmer’s haematoxylin except fig. 72 which is 
stained with acid fuchsin and methylen blue. Magnified by Zeiss, 
homog. imm. 1/12, Oc. 5. except figs. 67, 69, 72, 74, 75 which are drawn 
with Zeiss, homog. imm. 1/12, Oc. 4. Fig. 81 shows head of nearly 
mature spermatozoon, killed with picro-acetic acid and stained with 
picro-carmine. Fig. 82 represents cyste containing nearly matured 
spermatozoa. At right end of figure large supporting cell is shown. 
Treated as above. Zeiss, homog. imm. 1/12, Oc. 3. Fig. 83 shows 
