SPERMATOGENESIS OF EUSCHISTUS 785 
to have no relation to the idiozome of the spermatocytes nor to 
the sphere of the spermatids. It has no local connection with 
the idiozome, the nucleus or the centrioles, and would appear to 
be a structure entirely distinct from the idiozome, arising in 
a different place and at a later time; it has only a short persistence 
and disappears entirely before the maturation divisions. It is 
not clear whether this body has any homologue in oocytes, for 
it does not appear related to the vitellogenic layer (that portion 
of the yolk nucleus not comprising the idiozome). 
The other special inclusions of the cytoplasm of the sperm 
cells are those bodies first recognized by Benda (’98) as specific 
cell granules, and named by him mitochondria. Henking (’91) 
was the first to figure them in Hemiptera.!8 Good reviews on 
these bodies have been written by Meves (’00, ’02b, ’08b), Benda 
(03), Waldeyer (’01), Korschelt and Heider (’02), Goldschmidt 
(04). Their great interest lies in the fact that they appear to be 
constant components of the mature germ cells; and that they 
develop in embryonic cells into various filar structures such as 
connective tissue fibrils, myofibrils and neurofibrils, as shown 
especially by Meves (07a, ’08, 710), Duesberg (10), Korotneff 
(09), Hoven (10). Interest in them has culminated with the 
hypothesis of Meves (’08) that they represent an important hered- 
itary substance which has the same relation to the cytoplasm 
as the chromosomes to the nucleus, and this has received support 
from the discovery of Duesberg that they persist during cleavage 
cells in both animals and plants. And it may be noted that 
Benda’s original criterion of them, that they stain blue with his 
18 Their synonymy is already rather confusing. By ‘mitochondria’ Benda 
intended granules taking a particular stain, and by ‘chondriomita’ rows of such 
granules enclosed in plasma threads. Meves (’07b) proposed the name ‘chon- 
driom,’ later replaced (Meves, ’08) by ‘chondriosome,’ to include both the single 
granules or mitochondria proper, and also the chains of such granules; for the 
latter he proposed (’07b) the name ‘chondriokonta,’ a chondriokont differing from 
a chondriomite in being a chain of granules not enclosed in a plasma thread. To 
corresponding chains Heidenhain (1900) gave the name ‘pseudochromosomes,’ 
while Goldschmidt (1904) and some of his followers include the mitochondria 
under the term ‘chromidia.’ 
