PLATE LVIII. 



Fig. 



1. Head of Eidalia nebidosa, Mont., from the dorsum. Enlarged. 



2. Head of the foregoing with the proboscis extruded. Enlarged. 



3. Head of Uulalia viridis, 0. E. M., with the proboscis extruded. Enlarged. 



4. Head of Eulalia macroceros, Grube. Enlarged. 



5. Head of Phyllodoce groenlandica, (Erst., from St. Andrews. Enlarged. 



6. Head of Anaitis Kosteriensis, Mgrn. Enlarged. 



7. Head of Anaitis Jeffreysii, McL, from Valencia Harbour. Enlarged. 



8. Head of Genetyllis hibernica, McL Enlarged. 



9. Head of Eteone arctica, Mgrn., from H.M.S. ' Valorous.' Enlarged. 



10. Head of Mysta barbata, Mgrn., dredged off the Isle of Man. Enlarged. 



11. Head of Mystifies Lizzise, n.s., from Cape Sagres, 'Porcupine,' 1870. Enlarged. 



12. Head of Gphiodromus flexuosus, D. Ch. Enlarged. 



13. Anterior end of the foregoing with the proboscis extruded. Viewed from the ventral 



surface. Enlarged. 



14. Head of Gastalia arctica, Mgrn., from west coast of Ireland. The frontal tentacles 



have been lost. Enlarged. 



15. Dorsal surface of the head of Gastalia fusca, Johnst. Enlarged. 



16. Ventral view of the same species with the proboscis exserted. Enlarged. 



17. Head of Leocrates atlantica, Poule. The specimens unfortunately were injured and 



imperfectly preserved. Enlarged. 



18. Head of Dalhousiella Garpenteri, McL, from an indifferent specimen. Enlarged. 



19. Head (imperfect) of " Sph&rosyllis ovigera, Lghns.," from Dr. Allen. X about 35. 



20. Head and extruded proboscis of Phyllodoce lamelligera, L. (drawn by Mrs. Sexton). 



Enlarged. 



21. Head of Phyllodoce maculata, L., with proboscis extruded (drawn by Mrs. Sexton). 



Enlarged. 



22. Head of Eumida sanguined, (Erst., with proboscis exserted (drawn by Mrs. Sexton). 



Enlarged. 



23. Head of Eulalia tripunctata, McL, with proboscis thrust out (drawn by Mrs. Sexton). 



x 17. 



24. Abnormal tail of Phyllodoce maculata; L., with one large and four smaller anal cirri 



in pairs, from St. Andrews. Enlarged. 



25. Tip of tail of Phyllodoce rubiginosa, De St. Joseph, from Plymouth. Enlarged. 



