SPERMATOGENESIS. 
Gen. Sub. 21 
e. SPERMATOGENESIS. 
Baelowitz, E. Weitere Beobachtungen fiber den feineren Bau der 
Safigethier-spermatozoen. Z. wiss. Zool. lii, pp. 217-293, 3 pis. 
. Die Bedeutung der Yalentin’schen Querbander am Spermatozoen- 
lcopfe der Saugethiere. Arch. Anat. Phys. Anat. Abth. (1891) pp. 
193-211, 
0 . Die innere Zusammensetzung des Spermatozoenkopfes der 
Saiigethiere. CB. Physiol, v, pp. 65-68. 
Bardeleben, K. Ueber den feineren Bau der menschlichen Spermato- 
zoen. Verb. Anat. Ges. 1891, pp. 157-165, 4 figs. 
Details as to minute structure of spermatozoa. In the spermatozoa of 
all animals there are to be distinguished : (1) generative matter ; (2) 
nutrient matter ; (3) motor protoplasm ; (4) adaptations for entrance 
into ovum. 
Benda, C. Neue Mittheilungen fiber die Entwickelung der Genital- 
drfisen und fiber die Metamorphose der Samenzellen (Histiogenese 
der Spermatozoen). Verh. Phys. Ges. Berlin, in Arch. Anat, Phys. 
Phys. Abth. 1891, pp. 549-552. 
^Bertaciiini, P. La Spermatogenesi nella Rana temporaria. Month. 
Int. J. Anat. Hist, viii, pp. 140-168, 2 pis. 
Brown-Si ; :quard. Remarques sur la spermine et le liquide testiculaire. 
Arch. Phys. xxiii, pp. 401-403. 
. Exposd de faits nouveaux montrant la puissance que semble avoir 
le liquide testiculaire contre certaihes maladies, et en particulier la 
tuberculose pulmonaire. T. c. pp. 224-229. 
Cunningham, J. T. Spermatogenesis in Myxine. Zool. Anz. xiv, pp. 
22-27. 
. Spermatogenesis in Myxine glutinosa. Q. J. Micr. Sci. xxxiii, 
pp. 169-186, 1 pi. 
Within the unripe capsules of the testis are “spermatocytes’’ (sper- 
matogonia), which multiply by karyokinesis and form spermatozoa. The 
chromatin of each spermatocyte nucleus forms a number of sperm-nuclei 
which pass out, point forwards, from the spermatoblast, trailing a thread 
of protoplasm behind them. The spermatogenesis is liker that of some 
Chaetopods and Molluscs than that of Vertebrates. 
°DunERN, G. Some Points on the Histology of Spermatozoa and allied 
Matter. Indian Med. Rev. ii, pp. 30-36. 
Etzold, F. Die Entwicklung der Testikel von Fringilla domestica von 
der Winterruhe bis zum Eintritt des Brunft. Z. wiss. Zool. lii, 
pp. 46-84, 1 pi. 
