18 
Marsh—On Two New Species of Diaptomus 
Explanation of Plate I. 
Fig. 1. 
” 2. 
” 3. 
Diaptomus mississippiensis —fifth foot of male X 163. 
abdomen of female X 163. 
fifth foot of female X 300. 
” 4. 
” 5. 
birgei —fifth foot of male X 163. 
fifth foot of female X 300. 
6. 
” terminal joints of male antenna 
X 300. 
