CYTOPLASMIC INCLUSIONS OF THE GERM-CELLS. 561 
‘ dittosomi ’) del fuso centrale, vengo ad ammettere che 
1’idiozoma abbia un importante ufficio nella formazione del 
fuso stesso : forse di significato assai piu profondo che non 
quello di una semplice azione protettiva. Non ho perd dati 
sufficients per definire la portata reale della partecipazione 
materiale dell’idiozoma alia formazione del fuso centrale ; 
credo tuttavia che la sostanza idiozomica non si esaurisca 
tutta nella produzione del giovane fuso centrale.” In a foot- 
note Terni informs the reader that in his work he could not 
demonstrate the existence of “ due mezzi fusi periferici nella 
profase dell prima divisione di maturazione.” 
Terni definitely describes the formation of an acrosome 
from a part of the archoplastn. In this he is in agreement 
with what Schitz found in Columbella. As I have already 
said I cannot find such a process in the snail, but I am quite 
open to conviction that the idiozomatic body contains the 
future perforatorium, though before coming to a conclusion I 
should like to have further evidence either way. I am quite 
certain that in the snail the archoplasm (and its Nebenkeru 
rods) does not approach the head of the nucleus in the way 
described by Schitz. In Term's case the nucleus seems to 
revolve somewhat after the acroblast has become stuck on 
one side. The acroblast is thus brought to the head end of 
the cell. Term's case seems very clear. 
Faure-Fremiet (7) in his comprehensive article, u Etude 
sur les mitochondries des Protozoaires et des Cellules Sexu- 
elles,'' gives figures and describes the mitochondria of Helix 
pomatia and Arion rufus. 
He fails to discover tbe micromitochondria, overlooks the 
acrosome, and gives unproportionate drawings of Nebenkern 
rods and chondriosomes. He definitely draws the batonettes 
at the poles of the maturation spindle. 
Though the minute cytology of the germ-cells of Helix lias 
been unsuccessfully dealt with by Faure-Fremiet, the real 
value of this observer’s work lies in his remarks on the 
Nebenkern in fresh preparations. He says : “ II m’a semble 
pourtant qu’ii (the Nebenkern) eta.it beaucoup plus facilement 
