26 Gen. Sub. general subjects. 
Henking, H. Untersuchungen fiber die Entwickluug der Phalangiden. 
Z. wiss. Zool. xlv, pp. 86-175, 4 pis. 
Observations on free nuclear formation. Ova without nuclei. Dis- 
appearance of nuclei. 
Hertwig, 0. Uber den Befruchtungs- und Theilungsvorgang des thier- 
ischen Eies unter den Einfluss ausserer Agentien. Jen. Z. Nat. xx, 
supp. pp. 17-24. 
Jaworowski, A. [See Cell.] Chironomus. 
Jhering, H. v. [See Reprod.] 
Ovum primitively forms multiple embryos; the polar cells are morpho- 
logically nothing less than abortive germs. 
Korschelt, E. ZurFragedcrUrsprung dor verschiedenen Zollonclomonto 
d. Insoktenovarion. Zool. Anz. viii (1885), pp. 581 & 599, ix (1886), 
p. 256. 
. Ueber die Enstehung und Bedeutuug der verschieden Zellenele- 
mente des Tnsektenovariums. Z. wiss. Zool. xliii, pp. 537-720, 5 pis. ; 
J. R. Micr. Soc. 1887, pp. 71 & 72. 
Ova, nutrieut cells, and epithelium all arise from similar indifferent 
dements in first rudiment of ovarian tubes. The nutritive cells are a 
secondary adaptation. “ Ooblast ” theory denied. 
. Ein weiterer Beitrag zur Losung der Frage nach dem Ursprung 
der verschiedenen Zelleneleineute der Insec tenovarien. Zool. Anz. 
ix, pp. 256-263. 
Corroboration of previous results, and criticism of those of Will, 
Schneider, and v. Wielowiejski. 
Krapelin, K. Bryozoen. Biol. Centralbl. vi, pp. 599-602, 59 vers. 
Naturf. Berlin : 1886. 
c Laboulbene, A. Note sur les oeufs remarquable d’un Insect Diptere. 
Ann. Soc. Ent. Fr. vi, pp. 285 & 286. 
List, J. H. Ueber die Enstehung des Dotters und Eizellen bei Orthezia 
cataphracta. Biol. Centralbl. vi, pp. 485-488. 
(1) Yolk flakes from modified epithelial cells of terminal chamber, 
which break down to form yolk of ovum. (2) Ova from modification of 
one or more cells of epithelium of the egg-chamber. 
^McMurricli, J. P. Embryology of Prosobranch Gasteropods, Stud. 
Biol. Lab. J. Hopkins Univ. iii, pp. 403-405, 4 pis. 
Inter alia — Various proportions of eggs (a) which develope and ( b ) 
which break down and form food. 
c Peracca, [Conte] Mario de. Osservazioni intorno alia deposizione 
ed mentazione artificiale delle ova deli’ Elaphis quaterradiatus , Latr. 
Boll. Mus. Zool. Torino, i, No. 16. 
Perez, J. Sur l’histogenese des elements couteuus dans les games 
ovigeres des Insectes. C.R. cii, pp. 181-183 & 557-559. 
The indifferent cell of the ovariole, instead of being transformed 
directly into an ovule, proliferates and forms endogenously a constant 
