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MONTGOMERY. 
[Vol. XV. 
la meme constitution filoi'de”; and similar nucleoli occur in the 
Protista and in various cells of the Arthropoda . The “ nucleole- 
noyau ” of the eggs of Cymbulia and Lithobius has a fine 
external membrane and a convoluted chromatin filament. In 
the amitotic division of the capsular ovarial cells of Gryllotalpa 
the nucleolus (formed of a central portion of chromatin and a 
peripheral layer of plastin) divides first so that each daughter- 
nucleus receives one nucleolus. But in the amitosis of the 
intestinal cells of Aphrophora the “nucleoles plasmatiques ” do 
not divide; and in the testicle cells (“metrocytes ”) of Scolo- 
pendra there is also a “nucleole plasmatique,” and at the 
commencement of the mitosis the “ nucleole se liquefie pour 
enrichir le caryoplasma,” and is not to be found later. The 
amitotic division of the fat cells of Geotrupes is introduced by 
a division of the “ nucleole-noyau.” 
Frenzel (’85) studied the cells of the mid-gut in insects at 
various stages of development. Bombyx dispar , larva: one 
large nucleolus containing a vacuole, in which lies a small 
spherical “ Nucleollolus.” Tachina, larva: here is one large 
nucleolus, “mit kurzen zackigen Auslaufern. In seinem 
Innern umschliesst er fast stets wenigstens einen, in der Regel 
aber mehrere, etwa 6 bis 12 , kugelige oder matt aussehende 
Gebilde, welche nicht gerade den Eindruck von festeren 
Korpern, sondern vielmehr von Vakuolen machen.” In cylin¬ 
der and gland cells of various insect larvae the nucleus is 
filled with a homogeneous fluid, “ in welche sowohl echte 
Nukleolen, wie auch nucleolenartige Korper (‘ Keimflecken * 
oder * Nukleolide ’) einerseits und andererseits zahlreiche ver- 
schieden angeordnete sehr klein aber stets gleich grosse 
Kornchen eingelagert sind, die hier * Kerngranula * oder 
‘ -granulationen ’ heissen mogen.” 
Leydig (’85) noticed in ganglion cells of Astacus a large, 
spherical, granular nucleolus, in which is a large cavity ; this 
nucleolar cavity stands in communication with that of the 
nucleus itself. We read further : “ Die Korper im Kern, die 
man Nukleoli nennt, sind Bildungen verschiedener Art” ; some 
arise out of the nodal points of the nuclear network, others out 
of the “ Kernplasma.” 
