356 EXPLANATION OF THE PLATES. 



protruded. 4. Two segments. 5. A lateral view of a foot, re- 

 versed, 6. The setigerous papilla with its bristles and spine : — 

 all magnified. 



Figs. 7-10. Phyllodoce blUneata. 7. Nat. size. 8. The head. 



9, The middle segments. 10. Caudal extremity : — magnified. 



Figs. 11-15. Phyllodoce viridis. 11. Nat. size. 12. Head and an- 

 terior segments. 13. Head and proboscis extruded. 14. Middle 

 segments seen from below. 15. Caudal extremity : — magnified. 



Plate XVI. a. 

 Gattiola spectahilis. 



Fig. 1. Animal magnified. 2. Natural length. 3. Head, above. 

 4. Head, lateral view. 5. Mouth. 6. Foot, vdth cirrus and 

 bundle of bristles. 7. Bristle : — magnified. 



Plate XVII. 



Figs. 1-8. Nerine vulgaris. 1. Nat. size. 2. Anterior portion en- 

 larged. 3. View of a segment cut transversely. 4. The caudal 

 extremity. 5. A branchial filament separate. 6. Another 

 view of a branchia. 7. Bristles. 8. Oviform bodies : — mag- 

 nified. 



Figs. 9-13. Nerine coniocephala. 9. Nat. size, tail wanting. 



10. Proboscis magnified. 11. Antenna highly magnified. 

 12. One half of a cross section of an anterior segment. 13. A 

 similar view of a segment from near the middle : both magnified. 



Plate XVIII. 



Figs, 1-6. Leucodore ciliatus. 1. Nat. size. 2. Animal magnified. 



3. An antenna more highly magnified. 4. The bristles of the 

 fifth segment. 5. A branchial process separated to show the 

 cilia. 6. A few of the oviform bodies which lie between the 

 intestine and the skin : — all magnified. 



Figs. 7-12, Oirratidus borealis. 7. Nat. size. 8. Head and ante- 

 rior segments much magnified. 9. A view of the mouth mag- 

 nified. 10. Transverse section of a segment from the posterior 

 part of the body. 11. A side view of two segments from near 

 the middle, showing the spines greatly magnified. 12. The tail 

 much magnified. 



Plate XIX. 



Figs. 1-10. Trophonia plumosa. 1. Nat. size. 2. Anterior seg- 

 ments from above. 3. The same from below : magnified. 



4. Three segments laid open by an incision through the ventral 

 sui'face, and sj^read out. 5. A portion of the skin highly mag- 

 nified. 6. One of the front bristles. 7. A bristle from the 



