414 
J. bront£ gatenby. 
Nomenclature. 
In the spermatogonium of the secondary group four sets 
of bodies can be found in the cytoplasm : — 
(1) A centrosome. 
(2) A spindle body (“ spindelrestkorper,” “reste fusorial.”) 
(3) A body somewhat larger than the centrosome and 
staining darkly (micromitosome). 
(4) A cloud of granules (mitochondria). 
The first needs little notice, but I should mention that I 
have been unable to find an archoplasmic region surrounding 
the centrosome. Dr. Cook mentions an archoplasmic region 
after a spermatogonial division before the cells have com- 
pletely constricted, but figures nothing resembling Meves’ 
spermatogonial idiosome, nor can I find any similar body. 
The spermatogonial idiosome may be present in Paludina, 
but I feel sure that the centrosome in the “resting” 
spermatogonium is not imbedded in any such structure as 
Meves shows in his schematic plan. Even in the case of 
Paludina I do not think that Meves is justified in assuming 
that the acrosome body in the spermatid is identical with 
the idiosome body of the spermatogonium. His seemingly 
careful figures of this spermatogenesis provide not a tittle 
of evidence for this view, and I am at a loss to understand 
on what grounds he comes to his conclusions. 
The second body mentioned is that left by the spindle 
when the two cells are constricting. This body is certainly 
present in both secondary oogonia and spermatogonia, but 
later becomes absorbed, at least in the case of the male 
germ-cell. Its probable use and significance will be discussed 
in a later stage of this work. 
The third body is one quite overlooked by all previous 
observers. It later forms what Platner calls the small 
mitosome of the spermatid; Hemmgy calls it “la petite 
mitosome.” In this paper it will -be called the micromito- 
some. 
The fourth number refers to a cloud of granules which 
