98 Gr. 0. Sårs. 



Pl. IX. 



Alona a f Jini s, Leydig. 



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

 120 diameters, 

 »la. Same, ventral view. 

 t> lb. Caudal part, magnified 155 diameters. 



» lc. Adult male, viewed from left side; magnified 120 diameters. 

 » Id. Same, caudal part; magnified 185 diameters. 



Alona Iheringi, G. 0. Sars. 



Fig. 2. Adult female, viewed from left side; magnified 200 diameters. 



» 2a. Caudal part, magnified 300 diameters. 



» 2b. Adult male, viewed from left side; magnified 200 diameters. 



» 2c. Same, caudal part, magnified 300 diameters. 



Alona guttata, G. 0. Sars, var. parvnla. 



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

 245 diameters. 

 i> 3a. Caudal part, magnified 310 diameters. 



Alona intermedia, G. O. Sars. 



Fig. 4. Adult female, viewed from left side, magnified 200 diameters. 

 » 4a. Caudal part, magnified 300 diameters. 



Alona monacanthn, G. 0. Sars. 



Fig. 5. Adult ovigerous female, viewed from left side ; magnified 200 



diameters. 

 T 5a. Caudal part, magnified 300 diameters. 

 » 5b. Infero-posteal corner of left valve, exhibiting the dentiform 



projection. 



Alona glabra, G. O. Sars. 



Fig. 6. Adult ovigerous female, viewed from left side ; magnified 200 

 diameters. 

 » 6a. Caudal part, magnified 300 diameters. 



Alona verrucosa, G. O. Sars. 



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

 200 diameters. 

 > 7a. Caudal part, magnified 300 diameters. 



