SPECIAL SUBJECTS. 
Gen. Sab. 25 
Van Bambeke, C. Contribution pour servir a l’histoire de la vesicule 
gerrainative. Bull Ac. Belg. xi, pp. 14-28. 
Criticism of v. Wielowiejski. The distinctive characters of the 
germinal vesicle. 
Beddard, F. E. Observations on the Ovarian Ovum of Lepidosiren 
( Protopterus ). P. Z. S. 188b, pp. 272-292, 2 pis. 
. Ovarian Ovum of the Dipnoi. Zool. Anz. ix, pp. 635-637. 
-. Observations on the Development and Structure of the Ovum in 
the Dipnoi. P. Z. S. 1886, p. 505. 
Two kinds of structures derived from the germinal epithelium : («) an 
ovum, the equivalent of a single cell ; (6) multicellular or plasmodial, 
the resultant of a large number of cells. 
Bellonci, G. Intorno ad un principe di segmentazione e ad alcuni 
fenomeni degenerativi degli ovuli ovarici del topo e della cavia. 
Mem. Acc. Bologn. (1885), pp. 368 & 369. 
° — r— . Intorno alia cariocinesi nella segmentazione dell’ ovo di Axolotl. 
Atti Ac. Itom. xitf, pp. 3-7. 
-. Intorno al modo di genesis di un globul ) polare nell’ ovulo ovarico 
di alcuni mammiferi (topoliuo, caria, coniglio). Mem. Acc. Bologn. 
(1885), pp. 363-367, 1 pi. 
Blochmann, F. Uber die Reifung der Eier bei Ameisen und Wespen. 
Festschrift. Heidelberg: 1886. Biol. Centralbl. vi. pp. 554-559 
[Zool. Anz. Nos. 237 & 655] ; J. R. Micr. Soc. 1887, pp. 70 & 71. 
Not corroboratory of Wills’ “ ooblast ” observations ; neighbour nuclei 
appearing round surface of nucleus have no connection with follicle. 
Peculiar bacteroid-like masses in ovum and embryo. No reception of 
formed yolk particles by the egg from outside. Hints of polar cells ; 
distinctly in Musca vomitoria. 
Caunoy, J. B. La cytodierese de l’oeuf. La vesicule germinative et les 
globules polaires et l’Ascaris megalocephala. La Cellule, ii, pp. 1-76, 
3 double pis., iii, pp. 1-103, 3 pis. 
*Coutance, A. Les Theories de la Yio jugeos dans l’oeuf. Paris : 8vo, 
105 pp. 
Geddes, P. [See Reprod.] 
A predominant anabolism effects the differentiation of female elements. 
Hallez, P. Loi de l’orientation de l’e.nbryon chez les Insectes. C.R. 
ciii, pp. 606-608. 
“ The egg-cell has the same orientation as the maternal organism 
which produces it ; it has a cephalic pole and a caudal pole, a right side 
aud a left side, a dorsal surface and a ventral surface ; and the different 
surfaces of the ovum coincide with the corresponding surfaces of the 
embryo.” 
Heape, W. The Development of the Mole — The Ovarian Ovum. Q. J. 
Micr. Sci. xxvi, pp. 157-174, 1 pi. 
Description of immature and mature ova. 
