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J. BRONTE GA TENBY. 
chromatophile corpuscles join the archoplasmic bodies, and 
that these two categories of structures together form the 
acrosome. I have not examined any material of this Hemip- 
teron, but I rather doubt this description. He does not 
figure the centrosomes at any stage of sperm formation till 
the tail is beginning to grow, and according to his figures the 
centrosome does not divide. 
Following von Divaz there are formed in the cytoplasm two 
zones, peripheral and central, the latter forming the macro- 
mitosome (nebenkern). I am unable to compare this view 
with what I find in Lepidoptera. Divaz figures a macro- 
mi tosome, but gives the name “ mitochondrial body ” to 
another structure which is not of the same nature or staining 
affinity as what is generally called “ mitochondrial; ” The 
formation of the macromitosome and the appearance of what 
von Divaz calls the mitochondrial body is peculiar, and should 
be properly examined to ascertain its real nature, and its 
origin. Dr. Goldschmidt (16) lately discusses the “apyrene” 
spermatozoa from the fertilisation point of view, and, in 
agreement with the view already stated above, declares that — 
u We think it not unsafe to conclude from these facts that 
apyrene spermatozoa can not induce development, even if 
they enter the eggs, which, however, also seems improbable.” 
In the spermatogonium and early spermatocytes of moths 
the mitochondria appear to be dividing autonomously as they 
lie in the cytoplasm, but it would be impossible to come to a 
decision from such evidence, for the appearance of being in 
apparent division might be caused by the temporary fusion or 
apposition end-to-end of two separate mitochondrial bodies. 
Nevertheless I am inclined to believe that the mitochondria 
divide at this period by simple constriction, and some recent 
work which I have carried out on these bodies in the frog and 
the snail leads me to think such a view worthy of considera- 
tion. Future work on some form whose mitochondria 1 are 
1 In a forthcoming paper by me, two kinds of mitochondria are 
described in Helix, as well as some other constantly occurring bodies 
of doubtful nature. 
