PLATE LVIL 



Fig. 



1. Head of Nephthys eseca, 0. Fabr., from the dorsum. Enlarged. 



2. Under surface of head and anterior region of the same. Enlarged. 



3. Extruded proboscis of the foregoing — from the ventral surface. Enlarged. 



4. Extruded proboscis of the same form viewed from the free end. Enlarged. 



5. Proboscis slit longitudinally and exposing the teeth. Enlarged. 



6. Head of Nephthys Hombergil, Lamk., from the dorsum. Enlarged. 

 6a. Extruded proboscis of the same species from the dorsum. Enlarged. 



7. Under surface of the foregoing, showing the mouth and the parts behind it. Enlarged. 

 7 a. Head of the same with eyes from St. Magnus Bay (Dr. Gwyn Jeffreys). Enlarged. 



8. Head and exserted proboscis of Nephthys hystricis, McL, from the dorsum. Enlarged. 



9. Lateral view of the same proboscis. Enlarged. 



10. Dorsal view of the head and proboscis of Nephthys longisetosa, (Erst. Enlarged. 



11. Proboscis of the same partially extruded. Enlarged. 



12. Proboscis of the foregoing wholly withdrawn. Enlarged. 



13. Head of Nephthys Grubei, McL, from the dorsum. Enlarged. 



14. Ventral surface of the foregoing. Enlarged. 



15. Head of Nephthys Johnstoni, Ehlers, viewed from the dorsum. Enlarged. 



16. Ventral surface of the same. Enlarged. 



17. Head of Nephthys cirrosa, Ehlers, with extruded proboscis, from the dorsum. 



Enlarged. 



18. The same from the ventral surface. Enlarged. 



19. Head and anterior region of Nephthys incisa, Mgrn., from Graiway. Enlarged. 



20. Ventral surface of the foregoing showing the mouth. Enlarged. 



