784 THOS. H. MONTGOMERY, JR. 
has shown that in the oocyte of the bat they may persist up to 
the maturation mitoses.” In young oocytes of the guinea pig I 
have found it to have the appearance described by von Wini- 
warter. 
In animal spermatids there are two cytoplasmic bodies which 
may be combined or separate, and which have been variously 
known as Nebenkerne and spheres. Meves (’00) has shown that 
the Nebenkern of La Valette St. George is composed of granules 
(La Valette’s ‘cytomicrosomes’) which are comparable to the 
mitochondria of Benda, and the true Nebenkern is thus mivo- 
chondrial. The other ‘sphere’ of the spermatid Meves (’97, 
’02) has called an ‘idiozome,’ homologizing it with the idiozome 
of a spermatogonium or a spermatocyte. I believe this homology 
to be a mistaken one, for this sphere of the spermatid behaves 
quite differently from a true idiozome in being vacuolar and 
especially in having no connection with the centrioles. There- 
fore the sphere of the spermatid should no longer be called an 
idiozome but rather the ‘sphere of the spermatid’ or the ‘spermat- 
idosphere.’ In Euschistus this sphere of the spermatid, as ina 
number of insects, undergoes rather complicated movements, 
then divides into two, and the anterior portion passes to a position 
at the apex of the sperm and there becomes the lance or perfora- 
torium; it thus produces the same structure as in most other 
flagellate spermatozoa. But I do not think it likely that this 
lance is of any mechanical service in penetrating the egg, for in 
EKuschistus it is an exceedingly delicate and often branched fila- 
ment, without any rigidity. Then Yatsu (’07) has shown that it 
is rather the shape of the nucleus of the sperm that is adapted 
for entering the egg. In Euschistus this lance enters into the 
cytoplasm of a follicular nurse cell; therefore it may rather have 
the value of a nutritive pseudopodium. 
In spermatocytes of Euschistus another sphere arises, at 
about the time of disintegration of the idiozome, and it appears 
17 Compare especially Conklin ’02, Van der Stricht 704, ’05, 09, von Winiwarter 
1900, 09, Bouin, ’05. 
