AN EXTRA DYAD AND EXTRA -TETRAD IN CAMNULA 381 
In individual 2511 a moderate-sized chromatoid body can 
often be seen in the cytoplasm, at about the pachytene stage. 
Small bodies can sometimes be found, too, in the cytoplasm of 
germ cells of 2525 at this stage. In individuals of this type a 
single conspicuous body is never seen in the metaphase of the 
first mitosis, but chromatoid granules are often scattered about 
through the cytoplasm in both the first and second divisions (¢ in 
figs. 65, 68, 106, 108, 109, 114, 117). 
Sometimes, as in individual 2526, there is never present a 
chromatoid body as such, but several chromatoid granules are 
usually observed in all cells after the zygotene stage (c in figs. 
134, 137, 138, 139): 
In individuals 2511, 2525, and 2526, since the chromatoid 
granules are scattered about at random through the cytoplasm 
at the first and second divisions, it is evidently impossible for these 
granules to be distributed to one-fourth of the spermatids in the 
exact manner that occurs in the case of the chromatoid bodies in 
Pentatoma (Wilson, 713) and Rhomaleum (Plough, °17). 
One cannot be sure in individuals like 980, which exhibit a 
reversed staining reaction (McClung, 718), if chromatoid granules 
are present or absent. The cytoplasm is darkly stained and 
highly granular. There is certainly no single large chromatoid 
body present. 
Granules staining like chromatin can sometimes be seen in the 
apical cell, primary spermatogonia, and early secondary sperma- 
togonia (c, fig. 49). These are prokably the same as the ‘neutral 
red granules’ of Lewis and Robertson (’16) and Plough ('17), 
which Plough identified with the chromatoid body. 
The origin of the chromatoid body in Camnula I have not 
attempted to work out. This, if it appears worth while and 
feasible, can be better undertaken in connection with some 
breeding experiments which it is hoped to start in the future. 
Where there is such variation between individuals in regard to 
this structure, it would seem better to know the genetics of the 
case before undertaking an extended investigation. 
