AN EXTRA DYAD AND EXTRA TETRAD IN CAMNULA 379 
follicles in a testis. Counts made in eight individuals indicate 
that the number for each testis in Camnula is in the neighborhood 
of thirty or sixty for the whole organ. 
Each follicle (Sutton, ’00, fig. 1; Davis, ’08, fig. A; Robertson, 
16, plate III) is enclosed in a membrane of connective tissue 
and is connected at its cephalic or proximal end with the vas 
deferens. In section there can usually be seen at the distal end 
the apical cell surrounded by the primary spermatogonia. ‘The 
secondary spermatogonia arise by mitotic division from the pri- 
mary spermatogonia in the usual manner. ‘The former can be 
distinguished from the latter by their more proximal position in 
the follicle and by the fact that they are arranged in groups or 
cysts, each cyst being surrounded by an investment of connective 
tissue. 
All the secondary spermatogonia within a cyst are, of course, 
descendants of a single cell. “Sutton is the only student of 
acrididian spermatogenesis who gives the definitive number of 
secondary spermatogonia for each cyst. He estimates that in 
Brachystola magna the number is 256 (Sutton, ’00, 02). In 
Camnula there seems to be invariably 64. Since each of these 
becomes transformed into a first spermatocyte, the number of 
first spermatocytes within a cyst is also 64. Hence there are 
128 second spermatocytes in each cyst and 256 spermatids. 
THE CHROMATOID BODY 
Chromatoid bodies, or similar granules, have been described 
for the rat by Lenhossek (’98), Duesberg (’08), Regaud (10), and 
Allen (18), and for the Crustacea by Fasten (14, 718). Among 
insects such bodies have been described by Wilson for the Hemip- 
tera (13); by Lewis and Robertson (16), Payne (’16), and 
Plough (717) for the Orthoptera. 
In the main the cytoplasmic body which is present in the germ 
cells of Camnula behaves like similar structures described by 
Wilson (713) for Pentatoma, and Plough (’17) for Rhomaleum. 
Unlike the body in Rhomaleum, however (Wilson gives an account 
of its behavior in only a single individual of Pentatoma), its 
behavior is not constant for the species. In some individuals, as 
