302 MONTGOMERY. [Vol. XV. 



ferox the nucleolus consists of (i) a peripheral, less deeply 

 staining portion ; and (2) of a more deeply staining and more 

 highly refractive central portion, in which one large and several 

 smaller vacuoles lie : " Chose remarquable dans la vacuole 

 centrale se voyait, a I'dtat frais, un granule fonc^, doue d'un 

 mouvement tres vif "; in this germinal vesicle a small, finely 

 granular nucleolus is also present. Amoeboid movements of 

 the germinal spot of Periplancta were noticed. In the egg 

 of Zilla there are from one to three homogeneous, spherical 

 nucleoli, as also a large " tache principale"; the latter is com- 

 posed of two or three different substances, somewhat as in 

 Amanrobhis. 



Carnoy ('86), egg of Spiroptera strumosa: there is one large, 

 central " nucleole nucleinien," sometimes also one or two small 

 " nucleoles plasmatiques "; the former nucleolus is the only 

 part of the nucleus which stains deeply with methyl green ; 

 it is bounded by a fine membrane, and contains eight "baton- 

 nets " (chromosomes), so that it is comparable to a " nucleole- 

 noyau." Nematode irom the stomach of Scylliuin canicula: in 

 the " ceufs tr^s jeunes . . . le filament nucleinien y est assez 

 puissant, il parait continu. . . . Nous n'avons pu voir s'il se 

 scindait d'abord en trongons ; nous croyons plutot qu'il se 

 localise par le retrait de ses anses, pour constituer un nucleole 

 nucleinien pelotonnd. Ainsi nait la tache de Wagner. Elle 

 est toujours simple ; elle se colore peu par le vert de methyle " ; 

 no "nucleoles plasmatiques" are present in this nucleus. In 

 the egg of Filaroides mnstelariim one or two " nucleoles plas- 

 matiques" occur; but in that of Ascaris Imnbricoides such 

 nucleoli are usually absent, and the chromatic filament extends 

 through the whole nucleus. In Ascaris sp. (from the dog) there 

 is one "nucleole plasmatique" in young eggs. 



Heathcote ('86) noticed in the egg oijii/us one nucleolus with 

 vacuoles ; it disappears before the production of the pole bodies. 



Knappe ('86), ovarian ova of Biifo : The nucleoli show amoe- 

 boid movements in life, and these movements probably lead to 

 the dissolution of the nucleoli, by causing the latter to first 

 break into fragments, these fragments afterwards dissolving in 

 the nuclear sap. 



