Fresh-water Entomostraca of South America. 97 



Fig. 2. Same, ventral view (right antenna omitted). 



» 3. Rostral prominence, with right antennula, viewed from the 



anterior face; magnified 155 diameters. 



» 4. Leg of 1st pair; magnified 185 diameters. 



» 5. Leg of 2nd pair. 



» 6. Leg of 3rd pair. 



» 7. Leg of 4th pair. 



» 8. Leg of 5th pair. 



» 9. Detached ephippium, viewed from left side. 



» 10. Caudal part, lateral view, magnified 155 diameters. 



Ilyocryptus sordidus (Lièvin). 



Fig. 11. Adult ovigerous female viewed from left side ; magnified 155 

 diameters. 

 » 12. Labrum together with left antennula, viewed from left side; 

 magnified 245 diameters. 



PI. VIII. 



Leydigiopsis curvirostris, G. 0. Sais. 



Fig. 1. Adult ovigerous female, viewed from left side; magnified 100 

 diameters. 



» 2. Same, ventral view. 



» 3. Head, with left antenna fully drawn, viewed from left side; 



magnified 185 diameters. 



» 4. Caudal part, lateral view. 



» 5. Leg of 1st pair. 



» 6. Leg of 2nd pair. 



» 7. Leg of 3rd pair. 



» 8. Leg of 4th pair. 



» 9. Leg of 6th pair. 



» 10. Adult male, viewed from left side ; magnified 100 diameters. 



» 11. Same, leg of 1st pair; magnified 185 diameters. 



Leydigiopsis megalops, G. 0. Sars. 



» 12. Adult ovigerous female, viewed from left side; magnified 



100 diameters. 

 » 13. Head, with left antenna fully drawn, lateral view; magnified 



155 diameters. 

 » 14. Caudal part, lateral view. 



7 — Archiv for Math, og Naturv. B. XXIII. Nr. 3. 

 Trykt den 19. Marts 1901. 



