PLATE XVI. 



Figs. 1-4, 6-14. Undina darwinii, Lubbock. 



Fig. 1. Male, seen from left side, magnified 40 diameters. 



Fig. 2. Anterior antenna of male. 



Fig. 3. Anterior antenna of female. 



Fig. 4. Apical joints of the same, more highly magnified. 



Fig. 6. Mandible and palp. 



Fig. 7. Maxilla, 



Fig. 8. Anterior foot-jaw. 



Fig. 9. Posterior foot-jaw. 



Fig. 1 0. Outer branch and base of third swimming foot. 



Fig. 11. Right fifth foot of male. 



Fig. 12. Left fifth foot of male. 



Fig. 13. Abdomen of male. 



Fig. 14. Abdomen of female. 



Figs. 15, 16. Scolecith/Hx minor, n. sp. 



Fig. 15. Fifth pair of feet of male. 

 Fig. 16. Fifth pair of feet of female. 



(The antenna represented in fig. 5 is that of a species of Calanus (IJinmarchicus), 

 and does not properly belong to this plate.) 



