78 G- O. Sars. 



Fig. 2. Another female, with winter-eggs and the ephip- 

 pium in process of formation, viewed from the 

 dorsal face (rami of the antenna? not drawn) 



» 3. One of the antennulæ, more highly magnified. 



» 4. Leg of 1st pair. 



» 5. Outer part of tail. 



» 6. Extremity of same, still more highly magnified. 



» 7. Ephippium from left side. 



» 8. Adult male, viewed from right side; magnified 95 

 diameters. 



PI. V. 



llyocryptus sordidus, Lièvin. 



Fig. 1. Adult female, with 7 lines of growth, seen from 

 left side; magnified 102 diameters. 

 » 2. One of the antennulæ, more highly magnified. 

 » 3. Tail. 



Chydorus Leonard), King. 



» 4. Adult female, seen from left side; magnified 120 



diameters. 

 » 5. Tail of same, more highly magnified. 



Chydorus globosus, Baird. 



» 6. Adult female, seen from left side; magnified 104 



diameters. 

 » 7. Tail of same, more highly magnified. 



Pleuroxus inermis, G. O. Sars. 



» 8. Adult female, seen from left side; magnified 104 



diameters. 

 » 9. Tail of same, more highly magnified. 



