B 
AN EXTRA DYAD AND EXTRA TETRAD IN CAMNULA 397 
maturation division, at least two classes of cells are found in 
every second spermatocyte cyst. Where an extra dyad is pres- 
ent in some first spermatocyte cysts of a gonad, second spermato- 
cyte cysts containing three numerical classes of complexes are to 
be expected. For a supernumerary dyad in Camnula, as is the 
case for all such elements, so far reported in the Acrididae, usu- 
ally passes undivided into one of the daughter cells at the first 
maturation division, and whether it accompanies the accessory 
or not is a matter of chance. 
It is usually not possible to secure counts in more than one cyst 
and one cell generation within a particular follicle. But tables 
1, 2, and 3 show where such counts have been obtained, they are 
constant for the follicle prior to the second spermatocyte 
generation. 
In individual 980 (table 1, pls. 3 and 4) counts have been ob- 
tained in several cysts within each of the following follicles: C, 
D, E, H, J, and M. Im each of the follicles KE, H, J, arid M 
counts are given for two different cell generations. It will be 
noted that the first spermatocyte counts (follicles C, D, H) are 
constant for the follicle. In follicle H the metaphases of sperma- 
togonial cyst 20 each contains twenty-five dyads (pl. 4, fig. 
40). If the numerical organization is consistent for the follicle, 
and if the twenty-five dyads consist of twelve pairs of chromo- 
somes plus the accessory, we should find in the first spermato- 
cyte complexes twelve tetrads plus the accessory (a dyad); and 
this is exactly what is found in cysts 11 and 16 of this follicle. In 
follicle M the spermatogonial metaphases of cyst 21 consist of 
twenty-five dyads each and the expected first spermatocyte 
complexes are found in cyst 17 (plate 4, fig. 33). Spermato- 
gonial complexes consisting of twelve pairs of dyads plus the 
unpaired accessory should give two classes of second spermatocyte 
metaphases, containing, respectively, twelve and thirteen dyads. 
This is what is found in follicle J. But there is recorded in addi- 
tion three exceptional second spermatocyte complexes which are 
interpreted as containing eleven dyads each. All spermatogonial 
complexes consisting of twenty-six dyads so far found in Camnula 
seem to be made up of twelve pairs of chromosomes plus an un- 
