EXPLANATION OF PLATES. 
Abbreviations. 
cl. /. axial filament. 
ac. acrosome. 
al. c. alimentary canal. 
arch, archoplasm. 
hr. c. mother branch cell. 
c. centrosome. 
c. c. cyst cells. 
cn. 1. tunica propria. 
cy. c. cytocyst. 
ep. epithelium. 
/. follicle. 
g. c. gonocyst. 
g. m. s. grandmother stem cell. 
h. heart. 
h. n. head nurse-cell. 
m. muscle. 
m. n. cortical nucleus. 
n. nucleus. 
n. c. nerve cord. 
n. k. nebenkern. 
p. ct. primary spermatocyte. 
p. g. primary spermatogone. 
p. 1. pigmented layer. 
pt. m. tunica adventitia. 
s. ct. secondary spermatocyte. 
s. g. secondary spermatogone. 
sp. c. spermatocyst. 
spz. spermatozoon. 
st. spermatid. 
st. c. stalked cell. 
t. testis. 
tr. trachea. 
v. cl. vas deferens. 
x. free stalked cell. 
