258 BULLETIN OF THE UNITED STATES PISH COMMISSION. 



. EXPLANATION OF PLATES. 



PLATE XXXVII. 



* 



Fig. 1. Daplinia pulex, var. pulicaria. Male. 

 Fig. 2. Daphnia dentifera. 

 Figs. 3, 4. Cypris barbatus. 



PLATE XXXVIII. 



Figs. 5-8. Cypris barbatus. (5) First antenna. (6) Second antenna. (7) Postabdomen. (8) Man- 

 dible. 



PLATE XXXIX. 

 Figs. 9-12. Cyclops thomasi. (9) First leg. (10) Second leg. (11) Third leg. (12) Fourth leg. 



PLATE XL. 



Fig. 13. Cyclops thomaii, fifth leg. 



Figs. 14-17. Cyclops capilliferus. (14) Adult female. (15) First leg. (16) Fourth leg. (17) Fifth 

 leg. 



PLATE XLI. 



Fig. 18. Cyclops capilliferus, antenna of female. 



Figs. 19-21. Epischura nevadensis, var. Columbia. (19) Abdomen of male. (20) Fifth pair of legs 



of male. (21) Fifth pair of legs of female. 

 Fig. 22. Diaptomus piscinas, fifth pair of legs of male. 



PLATE XLII. 



Figs. 23-25. Diaptomus skoshone. (23) Fifth pair of legs of male. (24) Fifth leg of female. 

 (25) Right antenna of male. 



Figs. 26-28. Diaptomus lintoni. (26) Fifth leg of female. (27) Fifth pair of legs of male. (28) Ter- 

 minal segments of antenna. 



