PLATE CXX. 



Fig. 

 1. Reproduced caudal region of Thelepus cincinnatus, var. andreanse, Mcintosh. 

 St. Andrews. Enlarged. 

 ^2. Anterior end from S.W. Ireland. Enlarged. 



3, Lateral view of Terebellides stroemi, Sars. Slightly enlarged. 

 __4„ Ventral aspect of a portion of Poly cirrus aurantiacus, Grube. Enlarged. 

 Jx Reproduced tail of Sabella penicillus, L. 5 from St. Andrews. Enlarged. 



6. Ventral view of the anterior end of Sabella, BO., from Berehaven, Ireland. 



Enlarged. 



7. Branchia of Potamilla Torelli, Malmgren. Enlarged. 



7 a. Extremity of a branchial filament. Still more enlarged. 



8. Lateral view of Bisjpira volutacomis, Montagu, between tide-marks, Herm. Enlarged. 



8 a. Cephalic plate seen from the front. Enlarged. 



8 6. Ventral aspect of the anterior region. Enlarged. 



9. Ventral view of the anterior end of Branchiomma vesiculosum, Montagu. Enlarged. 

 J^a. Distal region of branchia of Branchiomma vesiculosum, Montagu. X 60 diam. 



10. Branchia of Amphitrite affinis, Malmgren. Enlarged. 



11. Branchia of Amphitrite gigantea, Montagu. Enlarged. 



12. Branchia of Nicolea venushda, Montagu, from Plymouth. Enlarged. 



12 a. Branchia of Nicolea venustula, var. zostericola, Montagu, from Plymouth. Enlarged. 



12 b. Branchia of Nicolea venustula (1863). X 40. 



13. Lateral view of Lysilla Loveni, Malmgren, St. Magnus Bay, Shetland. Enlarged 



under a lens. 



13 a. Ventral aspect of the foregoing. Anterior region with the tongue-shaped process 



in the median line. Enlarged under a lens. 



14. Ventral aspect of the anterior region of Dasychone argus, Sars. a, fold of collar ; 



b and c, folds at the mouth; d, foot with bristle-tuft and pigment-spot; e, copra- 

 gogue (groove). Enlarged under a lens. 



15. Scapha and posterior region of Euchone Normanl, Mel. St. Magnus Bay, Shetland. 



Enlarged. 



16. Branchial filament of Amphiglena mediterranean Ley dig. Torquay. X 60. 



17. Branchia of Loimia MontaguL Enlarged. (Vide p. 147.) 



