Text-fig. 1. 
I and II (after Meves). Shows Meves’ view of the relationship of the spermato- 
gonial and spermatid bodies. C. Centrosome. I. Idiosome. MD. Mito- 
chondrium. N. Nucleus. S. Spindle bridge (spindlerestkorper). Ill and 
IY. Shows the view adopted in the present paper. According to this the 
acrosome originates not from an archoplasmic zone, but from a definite number 
of bodies probably present in the spermatogonium ( X ). These form the acro- 
blasts (XX) in the spermatid. M'. The micromitosome. Y. The spermatid 
according to Platner and Munson ; the acrosome has been mistaken for the 
centrosome. The micromitosome has been figured. YI. The spermatid 
according to Meves. The micromitosome has been overlooked, the second 
centrosome not figured (though placed in Meves’ scheme in II), and the macro- 
mitosome (M") has been distorted by the acetic acid fixation. Tim acrosome 
is partially dissolved away (A.). YII. The spermatid according to the present 
phper. The macromitosome is a spireme (M"). The acroblasts are figured as 
well as tbe micromitosome and second centrosome. G. Excretory granules. 
