MONTGOMERY. 
[Vol. XV. 
360 
Sala (’95), ovum of Ascaris: in the first maturation mitosis 
the single nucleolus breaks into small pieces of various size, 
which gradually become scattered throughout the nucleus ; 
then they become smaller and spherical, and come to lie directly 
under the nuclear membrane. These fragments may possibly 
stand in a genetic connection with the corpuscles which are 
subsequently found at each pole of the spindle. And since the 
latter corpuscles may stand in some connection to a centrosome, 
“ es ist . . . nicht unmoglich, dass eine enge Beziehung besteht 
zwischen der Auflosung des Nucleolus und dem Auftreten des 
Centrosoma.” 
Schloter (’95), gland and liver cells of Salamandra: in 
the nuclei may be distinguished, besides the chromatin and 
paralinin, red-staining spherical corpuscles, the larger of which 
are regarded as plasmosomes. 
Sobotta (’95), ovum of Mus: in contradiction to the view of 
Holl, the chromosomes are not derived from the nucleoli only, 
but from the whole chromatic substance of the nucleus. 
van der Stricht (’95) observed in the larger ovarial eggs of 
Amphioxus that each contains a large nucleolus with an excen- 
tric vacuole ; it disappears at the time of formation of the pole 
spindle. 
Vejdovsky (’95a) found large, homogeneous nucleoli in the 
yolk cells of Prorhynchus hygrophilus , “ die nicht die gewohn- 
liche kugelige Gestalt bewahren, sondern immer in Theilung 
begriffen sind. Man findet meist doppelte Kernkorperchen, 
deren Halften durch eine ziemlich tiefe Furche von einander 
getrennt sind und die eine centrale Hohlung erkennen lassen. 
Nebstdem findet man in Drei- selbst Viertheilung begriffene 
Kernkorperchen. . . . Ich glaube . . . , dass man es hier mit 
einer Hypertrophie der normalen Kernkorperchen zu thun hat, 
welche schliesslich zur Degeneration der Kerne fuhrt”; these 
nucleoli occupy more than two-thirds of the space within the 
nucleus. In the ovum the nucleolus is much smaller, and 
shows a division into two parts (Fig. 89), but here these two 
parts are not of equal size. 
Vejdovsky (’95b) found in the egg of Bothrioplana a spherical 
nucleolus, “mit einem Nucleolinus.” 
