North American Sju'cies of Diajytomus. 207 



Plate XXXIII. 



Fig. 1. Diaptomus mississippiensis, last thoracic segment and abdomen 



of male. X 25(i. 

 Fi<;. 2. Fifth foot of female of same. X 256. 

 Fig. 3. Fifth pair of feet of male of same. X 256. 

 Fig. 4. Abdomen of female of same seen from below (Prof. Marsh's 



specimen). X 256. 



Plate XXXIY. 



Fig. 1. Diaptomus clavipes. right fifth foot of male (inner ramus want- 

 ing). X 280. 

 Fig. 2. Right antenna of male of same. X 140. 

 Fig. ;}. Fifth foot of female of same. X 400. 



Plate XXXV. 



Fig. 1. Diaptomus clavipes, fifth feet of male. X 280. 



Fig. 2. Last thoracic segment and abdomen of female of same. X 140. 



