16 ROBERT H. BOWEN 
knob-like apical piece (figs. 45 and 46), the further history of 
which has not been studied. 
Aside from the mitochondria, the spermatids of Ceuthophilus 
contain two cytoplasmic components of interest. The first of 
these appears in the early spermatids as a small flocculent mass, 
more or less granular in texture and blackening with osmie acid 
(modified Kopsch method) (fig. 41). Later this mass seems to 
move backward along the tail (fig. 42), but it no longer impreg- 
nates clearly and cannot be followed satisfactorily. It seems to 
correspond to the granular mass of similar behavior which I 
have described in the Hemiptera under the name of spermatid 
remnant (Bowen, ’22 a). In Ceuthophilus, however, this mate- 
rial seems to be traceable at least back to the maturation divi- 
sions, and a more complete study of its history and significance 
is now being attempted. 
The other cytoplasmic component referred to above is a body 
apparently homologous with the ‘formation juxta-nucléaire’ 
described in Gryllotalpa by Voinov (16). According to this 
author, the late primary spermatocytes contain four of these bodies 
which are distributed to the spermatids by a regular division 
process, each spermatid always receiving one juxtanuclear body. 
The last contention seems to hold true in Ceuthophilus, but I 
have been unable thus far to substantiate the earlier history as 
outlined by Voinov, and in my preparations this body first 
becomes clearly demonstrable in the differentiating spermatids. 
In shape, Voinov describes it as a flattened, oval body the peri- 
phery of which stains very darkly. In Ceuthophilus also it has 
the same disc-like shape, but whether the whole periphery stains 
heavily (after Benda and various Fe-hematoxylin methods) or 
only a portion of it, giving rise to a crescentic appearance, is not 
certain (figs. 48 and 45). It is clear from my figures, and in 
agreement with Voinoy, that the juxtanuclear body has nothing 
to do with the formation of the acrosome. It finally passes out 
along the tail together with the Golgi remnant, with which it 
probably shares a similar fate. As to the nature of this body, 
nothing definite can be stated. Its fate recalls that of the chro- 
matoid body, but in other respects there is little ground for com- 
