PLATE XCVIII. 



Fig. 



1. Head of Nerine cirratulus, Delle Chiaje. From a spirit-preparation. Enlarged. 



2. Head and anterior end of Scolecolepis vulgaris, Johnston. Spirit-preparation. 



Enlarged. 



3. Head and anterior region of Scolecolepis cirrata, Sars, from Peel. Spirit-preparation. 



Enlarged. 

 4 and 4'. Cephalic region of Scolecolepis fuliginosus, Claparede. The former shows the 

 central region more highly magnified, the latter the entire anterior region. 

 Enlarged. 



4 a, Caudal process. Enlarged. 



4b. Compound foot viewed from the ventral surface. Enlarged. 



5 and 5a. Dorsal and ventral views of the head and anterior region of Enspio Qravieri, 



Mcintosh, St. Peter Port, Guernsey. Enlarged. 

 5 c. Tail of the foregoing (P). Enlarged. 



6. Caudal region of Euspio Mesnili, Mel. (= Spio filicornis, Malmgren), from Bressay 



Sound, Shetland. X about 100. 



7. Portion of a tube of Ghxtopterus variopedatus with zoophytes growing on it. From 



St. Andrews Bay. Slightly enlarged. 



8. Cephalic region of Spio D. Deep sea fishing, St. Andrews. Enlarged. 



9. Snout of Aonides oxycephala, Sars. Enlarged. 

 9 a. Caudal end (devoid of processes). Enlarged. 

 9 6. Fourth foot, X 50. 



9 c. Twentieth foot, X 50. 



9 d. Foot about the middle of the body. X 50. 



9 e. Foot near tail. X 200. 



10. Snout of Spiophanes bombyx, Claparede. Enlarged. 



10 a. Tail. Enlarged. 



11. Head and anterior region of Spio filicornis, O. Fabricius. X about 50. 



11 a. First foot. X about 50. 



12. Dorsal view of the snout of Prionospio Malmgreni, Claparede. Enlarged under a lens. 



13. Caudal region of Polydora quadrilobata, Jacobi, after Carazzi. 



14. Head and anterior region of Pygospio elegans, Claparede. Enlarged. 



15. Head and anterior region of Polydora ciliata, Johnston. Enlarged. 



15 a. Caudal funnel. Enlarged. 



16. First foot of Polydora flava, seen from the dorsum. 



16 a. The same seen from beneath to show the bristles. X oc. 4, obj. A. 

 16 b. Lateral view of second foot. Enlarged. 



16 c. Foot from the middle of the body with the bristles. X oc. 4, obj. A. 

 16 d. Caudal funnel. Enlarged. 



17. Anterior foot of Polydora quadrilobata, Jacobi, var., seen obliquely to show the 



bristles. X oc, 4, obj. A. 



18. Tip of the tail of Cirratulus tentaculatus, Montagu, from Plymouth. Enlarged. 



19. Anterior region of Notomastus latericeus, Sars. Enlarged. 



20. Anterior region of male Gapitella capltata, O. Fabricius. Enlarged. 



21. Outline of variety of Notomastus latericeus, Sars (spirit-preparation), dredged off 



Cape Finisterre, ' Porcupine,' 1870. The proboscis is extruded. Enlarged. 



