EXPLANATION OF THE PLATES. 



PL I. 

 Liiunadia lenticularis (Lin.). 

 Fig. 1. Adult ovigerous female, viewed from left side; magnified 12 

 diameters. 



— la. Same, caudal part, more highh^ magnified. 



Scapholeberis Kingi, G. O. Sars. 

 Fig. 2. Adult gravid female, viewed from left side; magnified 98 dia- 

 meters. 



— 2 a. Same, dorsal view. 



— 2 b. Same, caudal part, more highlj^ magnified. 



Moina brevicornis,^G. O. Sars. 

 Fig. 3. Adult ephippial female, viewed from right side; nlagnified 64 

 diameters. 



— 3 a. Same, dorsal view. 



— 3 b. Same, caudal part, more highly magnified. 



Leydigia propinqva, G. O. Sars. 

 Fig. 4. Adult gravid female, viewed from left side ; magnified 85 dia- 

 meters. 



— 4 a. Same, caudal part, more highly magnified. 



Alona acuticostata, G. O. Sars. 

 Fig. 5. Adult female, viewed from left side; magnified 170 diameters. 



— 5 a. Same, caudal part, more highl}^ magnified. 



— 5 b. Adult male, viewed from left side. 



