EXPLANATION OF PLATES. 



PLATE n 



Fig. 1. Head of Panthalis pacifica. X 15. The terminal joint of one ten- 

 tacular cirrus on the right side had been lost. 



Fig. 2. First parapodium of Panthalis pacifica. X 23. 



Fig. 3. Eighth parapodium of Panthalis pacifica. X 23. 



Fig. 4. Terminal portion of seta from first parapodium of Panthalis pa- 

 cifica. X 280. 



Fig. 5. Tip of ventrally placed seta from first parapodium of Panthalis 



pacifica. X 280. 



Fig. 6. Tip of very large seta from eighth parapodium of Panthalis pa- 

 cifica. X 280. 



Fig. 7. Tip of dorsalmost seta from eighth parapodium of Panthalis pa- 

 cifica. X 280. 



Fig. 8. Head of Nereis notomacula. X 20. 



Fig. 9. First parapodium of Nereis notomacula. X 45. 



Fig. 10. Eighth parapodium of Nereis notomacula. X 45. 



Fig. 11. Seta from eighth parapodium of Nereis notomacula. X 280. 



Fig. 12. Hooked seta from eighth parapodium of Nereis notomacula. X 280. 



Fig. 13. Ventral crochet and dorsal aciculum of Leodice biannulata. X 280. 



Fig. 14. Head of Spio acuta. X 30. 



Fig. 15. First parapodium of Spio acuta. X 68. 



Fig. 16. Thirteenth parapodium of Spio acuta. X 45. 



Fig. 17. Seta of thirteenth parapodium of Spio acuta. X 185. 



Fig. 18. Parapodium from region of body behind twenty-fifth somite of 



Spio acuta. X 45. 



Fig. 19. Seta from first parapodium of Spio acuta. X 185. 



Fig. 20. Hooded seta from first somite of Spio acuta. X 185. 



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