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. 



11. Abdomen of female. 



12. Terminal spine of swimming foot. 



