68 Gen . Sul . , j. general subjects. 
description of peritoneal covering of testes, liberation of spermato- 
gemmae at 8-cell stage, the occasional apparent presence of nucleus or 
nuclei in the cytophore, the occurrence of twin spermatogemmae, &c. ; 
Voigt (717). — In Ophryotrocha ; Korschelt (352). — Echinoderm sper- 
matozoon, its morphology and physiology ; Field, G. W. (199). — Sper- 
matogonia and spermatocytes of snail j Bolles Lee (51). — Remarkable 
spermatozoa of Paludiuu vivipura ; Aueiibacu (14).— Double, coupled, 
or “.dejugated” spermatozoa of Dyticus, Acilius, Hyclaticus, and Oolym - 
betes ; Ballowitz (18). — Seminal cells ; Moser (482). — Chromatin 
reduction in the maturation of spermatozoa; Moore (465). — A note on 
dimorphism of spermatozoa ; Giard (245). — Cell degeneration in testes of 
young Mammals ; Bouin (53). 
c. Maturation . 
General summary ; Korschelt (353), Rawitz (562). 
Atlas; Wilson (761). — The iuitial stages; ELecker (275). — Peculiar 
mitosis in young oocytes of Salamander, possibly premature and abnormal 
maturation divisions ; Meves (443 ). — In Canthocamptua ataphylinua, Jur. : 
in the second division of the maturation process in Arthropods and the 
Salamander, there is a suppression of doubling by longitudinal division 
of chromosomes. Thus a reduction-division occurs. Comparison of 
maturation in Invertebrates with that in Vertebrates ; Hacker (275). — 
Both maturation divisions are reducing divisions ; vom Rath (556). — Dis- 
crepancies between Strasburger's account of the reduction of chromosomes 
in plant sex-cells and the observations of zoologists. Are the reductions 
observed by botanists only “ pseudo-reductions ” ? Hascker (277, 278). — 
Chromatin reduction in maturation ; vom Rath (556). — Reducing divi- 
sions in Metazoan reproduction ; Beard & Murray (29). — Maturation 
in Chcetopterus pergamentaceus ; Mead (435). — In Nemerteans ; Burger 
(85). — In Amphioxus ; Van der Stricht (676). — Maturation and fertili- 
sation in Amphioxus ; Sobotta (662). — Maturation in Echinoderm ova ; 
Wilson & Mathews (762). — In Phallusia mammillata ; Hill (308). — 
In Lumbricus ; Calkins (92). — In Macrobiotus macronyx ; Erlanger 
(185). — In Amphorina cosrulea ; Trinciiese (697). — In Seps chalcides ; 
Todaro (693).— In Ophryotrocha puerilis; Korschelt (352). — In mouse; 
Sobotta (663). 
d. Fertilisation. 
General summary; Korschelt (353), Wilson (759). — Atlas ; Wilson 
(761). — Process of fertilisation ; Ruckert (599). — Present state of 
knowledge as to ; Rosenstadt (592). — Import of fertilisation ; Haacke 
(270). — Investigations on fertilised ova of Echinoderms ; Kostanecki 
(356). — In Echinoids : only the sperm-nucleus has a centrosome which, 
divides into two. Probably the ovum-centrosome, which was not 
seen, degenerates* Fol’s quadrille a misinterpretation. , Criticism of 
