SPERMATOGENESIS, SEX AND REPRODUCTION. Gen. Sltb. 23 
,:: ’[Russo, A.] Richerche citologiche sugli elementi seminali delle Ophiumn 
(spermatogenesi-oogenesi). Int. Month. J. Anat. Phys. viii, pp. 293- 
329. 
Verson, E. Spermatogenese du Bombyx mori. Arch. Ital. Biol, xv, 
pp. 177-180. 
Whitman, C. 0. [See “ Sex and Reproduction.”] 
Zimmermann, K. W. Ueber den Kernteilungsmodus bei der Sperraa- 
togenese von Helix pomatia. Verb. Anat. Ges. 5 Vers. 1891, pp. 187— 
193. 
f. SEX AND REPRODUCTION. 
Auerbacii, L. Ueber einen sexuellen Gegensatz in der Chromatophilie 
der mannlichen und weiblichen Gescblecbtsproducte. Verb. Physiol. 
Ges. Berlin, 1890-91, in Arch. Anat. Phys. (Physiol. Abth.) 1891, 
pp. 532-535. 
. Ueber einen sexuellen Gegensatz in der Chromatophilie der 
Keimsubstanzen nebst Bemerkungen zum Bau der Eier und Ovarien 
niederer Wirbelthiere. SB, Ak. Berlin, 1891, pp. 713-750. 
The sex-elements differ in nuclear characters. The head of the ripe 
spermatozoon is cyanopbilous, the germinal vesicle and the nucleoli are 
erythrophilous. 
* -. Zur Charakteristik vou Ei und Samen. Berlin. Klin. Wochenschr. 
xxviii, pp. 908 & 909 ; Naturw. Wochenschr. vi, pp. 425 & 426. 
Bernard, H. Hermaphroditismus bei Phyllopoden. Jen. Z. Nat. xxv, 
pp. 337 & 338. [Cf. Nature, xliii, pp. 343 & 344.] 
Lepidurus glacialis , A pus caiicriformis, and Lepidurus productus are 
hermaphrodite — an adaptation to the risks of isolation. The males of 
Apodidm are generally smaller than the hermaphrodites. 
Bertkau, Pii. Beschreibung eines Arthropoden-Z witters. Arch. f. 
Nat. lvii, pp. 229-238, 1 pi. 
Hermaphrodite Lycosa. List of casually hermaphrodite Arthropods 
includes 361 cases : 9 Crustaceans, 3 Arachnids, and 349 Insects ! 
Cannieu, A. Sur 1’evolution sexuelle des Truites des Pyrenees. C.R. 
cxii, pp. 957-959. 
Cano, G. Morfologia dell’ appareccbio sessuale feraminile, glandole del 
cemento e fecondazione nei Crostacei Decapodi. MT. z. Stat. Neap, 
ix, pp. 503-532, 1 pi. 
Fulton, T. W. The Comparative Fecundity of Sea-Fishes. Rep. Fish. 
Scotl. ix, pp. 243-268. 
In a large number of fishes there are successive crops or layings of eggs. 
Tables are given showing the ratio of the weight of the ova present at 
