Fresh-water Entomostraca of South America. 101 



Fig. 5a. Head, viewed from left side (rami of antennæ omitted) ; 

 magnified 300 diameters. 

 » 5b. Caudal part, same amplification. 



Dnnhevedia odontoplax, G. 0. Sars. 



Fig. 6. Adult ovigerous female, viewed from left side; magnified 



165 diameters. 

 » 6a. Head, viewed from left side (rami of antennæ omitted) ; 



magnified 245 diameters. 

 » 6b Caudal part, same amplification. 



Pletiroxus similis, Vavra. 



Fig. 7. Adult ovigerous female, viewed from left side; magnified 

 155 diameters. 

 » 7a. Caudal part, magnified 245 diameters. 



» 7b. Posterior part of left valve, exhibiting the 2 small dentiform 

 projections at the infero-posteal corner. 



PI. XII. 



Euryalona occidentalism G. 0. Sars. 



Fig. 1. Adult ovigerous female, viewed from left side; magnified 

 95 diameters. 



» la. Same, ventral view. 



> lb. Caudal part, magnified 120 diameters. 



» lc. Leg of 1st pair, magnified 185 diameters. 



» Id. Leg of 2nd pair. 



» le. Leg of 3rd pair. 



» If. Leg of 4th pair. 



■> lg. Leg of 5th pair. 



» lh. Adult male, viewed from left side; magnified 95 diameters. 



Pseudalona latissima (Kurz). 



Fig. 2. Ephippial female, viewed from left side; magnified 120 dia- 

 meters. 

 » 2a. Caudal part, magnified 185 diameters 

 » 2b. Caudal part of a male specimen. 



Pseudalona longirostris (Daday). 



Fig. 3. Adult ovigerous female, viewed from left side; magnified 

 120 diameters. 



