PLATE IV. 



Pseudalibrotus Nanseni, G. 0. Sars. 



Fig. 1. Adult male, viewed from left side. 



2. Cephalon of female, with antennae, lateral view. 



3. Superior antenna of male. 

 4-. Inferior antenna of same. 



5. Part of flagellum more highly magnified, showing the arrange- 

 ment of the calceolae. 



6. A calceola highly magnified, lateral view. 



7. Same, front view. 



8. Posterior lip. 



9. Left mandible with palp, viewed from inner face. 



10. Same, without the palp, lateral view. 



11. Anterior maxilla. 



12. Posterior maxilla. 

 13. Maxillipeds. 



14. Anterior gnathopod. 



