Fresh water Entomostraca of South Arnerica. 95 



Pl. IV. 

 Simocephalus seniiserratus, G. O. Sars. 



Fig. 1. Adult ovigerous female, viewed from left side; magnified 52 



diameters. 

 s 2. Same, ventral view. 

 » 3. Head with adjoining part of carapace, viewed from left side 



(antennse omitted) ; magnified 82 diameters. 

 » 4. Frontral part of head, more highly magnified. 

 » 5. Caudal part, viewed from left side. 

 » 6. Left caudal claw, more highly magnified. 

 » 7. Adult male, viewed from right side; magnified 82 diameters. 

 > 8. Same, head with adjoining part of carapace, viewed from 



right side (antennae omitted); magnified 155 diameters. 

 » 9. Same, caudal part, lateral view. 



Simocephalus Iheringi, Richard. 



Fig. 10. Adult ovigerous female, viewed from left side; magnified 42 



diameters. 

 » 11. Head with adjoining part of carapace, viewed from left side 



(antennæ omitted); magnified 82 diameters. 

 i 12. Caudal part (not fully drawn), lateral view. 

 » 13. (Not numbered in the plate) Adult male, viewed from left 



side; magnified 82 diameters. 



PL V. 

 (Mnialdina Brazzai, Richard. 



Fig. 1. Adult ovigerous female, viewed from left side; magnified 95 



diameters. 

 » 2. Same, ventral view. 

 » 3. Head, without the antennæ, viewed from left side ; magnified 



160 diameters. 

 » 4. Caudal part, lateral view. 

 » 5. Legs of left side in their natural position, viewed from the 



outer face; magnified 185 diameters. 

 » 6. Leg of 1st pair, isolated. 

 » 7. Leg of 2nd pair. 

 » 8. Leg of 3rd pair. 

 » 9. Leg of 4th pair. 

 » 10. Leg of 5th pair. 

 » 11. Detached ephippium, viewed from left side; magnified 95 



diameters. 



