SPERMIOGENESIS OF HELIX ARBUSTORUM. 
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PLATE X. 
Fig. 1. Primary spermatocyte, abnormal division. Bouin’s picric-formol, Hei¬ 
denhain. 
Fig. 2. Secondary spermatocyte, resting stage. Perenyi’s fluid, Benda’s na¬ 
trium sulphalizarinate-toluidin blue. 
Fig. 3. Secondary spermatocyte, after a very short resting period. Bouin’s 
picric-formol, Heidenhain, preceded by anilin-blue. 
Fig. 4. Telophase of a primary spermatocyte, immediately followed by the 
second maturation division. Bouin’s picric-formol, Heidenhain. 
Fig. 5. Secondary spermatocyte, anaphase. Bouin’s picric-formol, Heidenhain. 
Fig. 6. Secondary spermatocyte, late anaphase. Bouin’s picric-formol, Hei¬ 
denhain. 
Fig. 7. Secondary spermatocyte, telophase. Bouin’s picric-formol, Heidenhain. 
Fig. 8. Secondary spermatocyte, telophase. Mayer’s picric-nitric acid, Benda’s 
crystal-violet. 
Fig. 9. Spermatids, arisen from the same primary spermatocyte. Bouin’s 
picric-formol, Heidenhain. 
Fig. 10. Secondary spermatocyte, telophase. Flemming’s weaker solution, 
Heidenhain. 
PLATE XI. 
Fig. 1. Spermatid, with end filament. Bouin’s picric-formol, Heidenhain. 
Fig. 2. Spermatid, some later stage. Sublimate-alcohol-acetic acid, Heiden¬ 
hain, preceded by bordeaux R. 
Fig. 3. Spermatid, still later stage. Bouin’s picric-formol, Heidenhain. 
Fig. 4, Spermatid, «noyau en Saturne». Flemming’s weaker solution, Hai- 
DENHAIN. 
Fig. 5. Spermatid, the fluid pressed out takes place at the end of the nucleus 
opposite to the axial filament. Flemming’s weaker solution, Heidenhain. 
Fig. 6. Spermatid, the fluid pressed out takes place at the side of the nu¬ 
cleus turned toward the axial filament. Sublimate-alcohol-acetic acid, Heidenhain. 
Fig. 7. Spermatid, with a small corpuscle at the summit of the nucleus. 
Mayer’s picric-nitric acid, Heidenhain. 
Figs. 8—TO. Considerably elongated spermatids. Flemming’s weaker solution, 
Haidenhain. 
Fig. 11. Anterior end of a spermatid. Perenyi’s fluid, Heidenhain. 
Fig. 12. Anterior end of a still more advanced spermatid. Bouin’s picric- 
formol, Heidenhain. 
Fig. 13. Anterior end of a spermatid with the perforatorium. Bouin’s picric- 
formol, Heidenhain. 
Fig. 14. Spermatid, near the end of the development. Bouin’s picric-formol, 
Heidenhain. 
Fig. 15—16. Heads of spermatozoa. Bouin’s picric-formol, Heidenhain. 
Fig. 17. Anterior part of a spermatozoon. Flemming’s weaker solution, Hei¬ 
denhain. 
Fig. 18. Posterior end of a spermatid in a late stage of the development. 
Bouin’s picric-formol, Heidenhain. 
Annales Musei Nationales Hungarici. Vili. 
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