8 Wisconsin Academy of Sciences, Arts, and Letters. 
The wall of the vagina shows in section a greater develop¬ 
ment of the muscular layers than any other part of the repro¬ 
ductive organs. A similar enlarged muscular layer was found 
by Verson and Bisson (12) for Bombys. The thin internal chit- 
inous layer is folded and in the epithelial layer the cells show 
a partial degeneration; the nuclei appear normal but the cyto¬ 
plasm has in part disappeared from many of the cells. The 
layer of circular muscles is wide and followed externally by a 
narrower longitudinal layer. 
Zoological Laboratory, 
University of Wisconsin, 
February, 1905. 
