10 Wisconsin Academy of Sciences, Arts, and Letters. 
EXPLANATION OF PLATES. 
b. c. 
Bursa copulatrix. 
0. 
Oviductus. 
ch. 
Chitinous layer. 
o. b. 
Ostium bursae. 
c. m. 
Circular muscles. 
o. c. 
Oviductus communis. 
d. s. 
Ductus seminalis. 
0. t. 
Ovarian tubules. 
ep. 
Epithelial cells. 
r. 
Rectum. 
gls. 
Glandulae sebaceae. 
r. s. 
Receptaculum seminis. 
it. 
Intestine. 
sec. 
Secretion of cement gland. 
1. m. 
n. ep. 
Longitudinal muscles. 
Nuclei of epithelial cells. 
Y. 
Vagina. 
All figures except 1. 2. 3, 4, and 8 drawn with camera lucida. 
