PLATE II. 



Metridia armata. 



Fig. 1. Male seen from right side. 



2. Anterior antenna of male. 



3. Mandible and palp. 



4. Maxilla. 



5. Anterior foot-jaw. 



6. Posterior foot-jaw. 



7. Foot of third pair. 



8. Fifth pair of feet of male. 



9. The same seen laterally. 



10. Fifth pair of feet of female. 



1 1 . Abdomen of female. 



12. Terminal spine of swimming foot. 



