PLATE L. 



Figs. 1 -1 0. Setella gracilis, Dana. 

 Fig. 1. Female, seen from left side; magnified 80 diameters. 

 Fig. 2. Anterior antenna of male. 

 Fig. 3. Posterior antenna. 

 Fig. 4. Mandible. 

 Fig. 5. Maxilla. 

 Fig. 6. Anterior foot-jaw. 

 Fig. 7. Posterior foot-jaw. 

 Fig. 8. One of the swimming feet. 

 Fig. 9. Foot of fifth pair, male. 



Fig. 10. The same, female. 



Figs. 11-17. Saphirina metallina, Dana. 

 Fig. 11. Male, seen from above. 



Fig. 12. Female, seen from above; both magnified 40 diameters. 

 Fig. 13. Anterior antenna. 

 Fig. 14. Posterior antenna. 

 Fig. 15. Foot of fourth pair. 



Fig. 16. Abdomen of female, more highly magnified. 

 Fig. 17. Corneal lenses. 



*•&■ 



Fig. 18. Saphirina gemma, Dana. 



Fig. 18. Inner branch and portion of outer branch of one of the swimming feet; a, one 

 of the apical spines, more highly magnified. 



