Special subjects. Geh . Sub. 29 
[von Ebner, Y.] Nachtrag “zur Spermatogenese bei den Saugethieren.” 
Op. cit. xxxi, 3, pp. 424 & 425. 
Historical note on an overlooked research by Sertoli. 
Fiedler, K. Ueber Ei- und Samenbilduug bei Spongilla jluviatilis. 
Z. wiss. Zool. xlvii, 1, pp. 85-128, 2 pis. 
The division of the nucleus of the original male cell ; one half rich, 
the other poor, in chromatin ; the former divides into spermatozoa. 
Gilson, 0. Etude compare de la spermatogdn&so chez les Arthro- 
podes. Troisi&me partie. — Conclusions. Cellule, iv. pp. 351-446, 
1 pi. (xvi). 
General review of previous results. Previous generalisations dis- 
cussed and rejected, but no other proposed. Beyond distinguishing three 
stages of cell-multiplication and differentiation, the author maintains the 
impossibility of formulating any law of spermatogenesis* 
Hickson, S. J. [See Oogenesis.] 
Jensen, O. S. Mitteilungen fiber die Struktur der Samenkorper bei 
Siiugotieren (reportod by 0. Zacharias). Biol. Contralb). vii, 21 , 
pp. 062-664. 
Koehler, R. Recherches sur la double forme des spermatozoides chez 
le Murcx brandaris et le M. trunculus. Rec. Z. Suisse, v, 1, pp. 101— 
150, 2 pis. 
. Sur la double forme de spermatozoides chez les Murex brandaris 
et trunculus et le developpement de ces spermatozoides. C.R. cvi, 
pp. 299-301. 
IColossow, A. Beitrag zur Frage von der Entwicklung der Samenfadeu 
bei Saugethieren. CB. med. Wiss. xxvi, pp. 562-565. 
Korotneee, A. Bsitriigc zur Spermatologie. Arch. mikr. Auat. xxxi, 
3, pp. 334-341, 1 pi., and Biol. Centralbl. vii, pp. 683 & 684. 
The main steps in the process in Alcyonella fungosa conform with the 
stages emphasized by v. la Yalette St. George. The author compares a 
spermatozoon to “ a free-living, highly specialised muscle-cell.” 
Massart, J. Sur Tirritabilit^ des spermatozoides de la grcnouille. Bull. 
Ac. Belg. xv, 5, pp. 750-754. 
Preliminary to a future demonstration of how sensitiveness to_ 
touch aids in the penetration of the spermatozoon into the ovum. 
^Niepsincj, G. Untorsuchungen iibor die Entwicklung und den feinston 
Bau der Samenfiiden einiger Saugetiere. Verb. Ges* Wfirzb. xxii, 2, 
2 pis. 
PreNANT, A. Observations cytologiques sur les 414ments s^minauA deS 
Gasteropodes pulmones. Cellule, iv, 1, pp. 137-^177, 2 pis* 
Especially the history of the “ nebenkern,” from its first appearance in 
the resting spermatogonium to its share in forming the spiral filaments in 
the spermatozoon. 
