28 Gen. Sicb. general subjects. 
glacialis and Astropecten ) may begin to develop without fertilization. 
The blastula stage may be readied. It seemed as if a secpud nuclear 
division, but no second extrusion occurred during the maturation of 
these partheuogenetic ova. 
°Herz, — . Beitrag zur Frage iiber die Ydrausbestimmung des Gesch- 
lechts. Arch. f. Thierheilk. xvi, pp. 84-100. 
Fulton, T. W. The Proportional Numbers and Sizes of the Sexes 
among Sea Fishes. Rep. Fish; Scotl. viii, pp. 348-350. 
°GeissleR* A. Beitrage zur Frage der Geschlechtsverhaltnisse der 
Geboreilen. Zeitschrift. k. Sachs. Statistischen Bureau, xxxv, Heft 
1 & 2. Report in Biol. Ceritralbl. i&, pp. 761 & 762. 
Gruber, A. Die Konjugation der Irifusorien. Biol. Ceritralbl. x, pp. 
136-150, 1 fig. 
On the results of Maupas and R. Hertwig; 
Guitel, F. Sur les Differences Sexuelles du Lepcldogaster bimaculaius , 
Flem. C.R. cxi, pp. 759-761. 
JanoSiK, J. [See Oogenesis.] SB. Ak. Wien, xcix, pp. 260-288, 1 pL 
If all were developed that is implicit in the incipient reproductive 
organs in Mammals, the result would be hermaphrodite organs, with 
internal testes and ovaries surrounding them. The same is true of the 
fowl. The cellsj which form spermatozoa, are descended from those due 
to the primary proliferation of the germinal epithelium ; the cells from 
which ova are formed are ontogerietically yolinger. 
Klebs, G. Nachtrag zu dem Aufsatz : Zrir Physiologic! der Fortpflan- 
zung. Biol. Centralbl. ix, pp. 753-755 ; cf. t. c. pp. 609-617. 
KleiN, L Vergleichende Uritersuchungen fiber Morphologie rind 
Biologie der Fortpflanzung bei der Gattung Volvoft. Volvox 
Studieri. in. Ber. Freiburg Ges. v, pp. 1-92, 5 pis. 
Important in relation to genera problems. 
c ‘Lameere, A. Etudes sur la Reproduction, i. A propos de la Matura- 
tion de i’OEuf Parth6nog6ndtique. II. Recherohes sur la Reduction 
Karyogamiqrie. Bruxelles : 8vo, pp. 88 & 78j 3 pis. 
Lankester, E. Ray. [See General.] Essay o'ri Farthenogeridsis. 
Malaquin, A. Sur la Reprddrictiori des Autolytes. O.F. cxi, pp. 989- 
991. 
Maupas, E. Sur la Multiplication et la Fecondation de Vllyddtina senta , 
Ehr. T. c. pp. 310-314 & 505-507. 
The “ winter-eggs ” of Hydatina senta are the fertilised eggs. Copula- 
tion has no effect on those forms that are about to lay feiriale eggs. Each 
egg is predestined in the maternal ovary. There is, in this case, no 
advantage in cross-fertilisation. 
