1909.] NATURAL SCIENCES OF PHILADELPHIA. 351 



Spheerodorum papillifer — figs. 11, 12. 



Fig. 11. — Parapodium X with setse, X 98. 

 Fig. 12.— Seta from X, X 440. 

 Spharodorum brevicapitis — figs. 13, 14. 



Fig. 13. — Parapodium X (the parts may be abnormally separated^owing to 



distention of body walls) without setae, X 56 

 Fig. 14. — Average seta from somite X, X 440. 

 Phi/llodoce ferruginea — figs. 15-18. 

 Fig. 15. — Anterior end, X 56. 

 Fig. 16. — Parapodium XXV with dorsalmost and ventralmost seta shown, 



X 56. 

 Fig. 17. — End of neuropodium showing tip of aciculum, X 500. 

 Fig. 18. — Profile and front view of region of articulation of seta from XXV, 

 X 440. 



Plate XVI. — Anaitis polynoides — figs. 19-21. 



Fig. 19. — Anterior end, from the dorsum, X 24 



Fig. 20. — Parapodium of XXV, anterior view, dorsalmost and ventralmost 

 setse shown, X 24. 



Fig. 21. — Profile and rear views of articular region of two seta? from somite 

 X, X 360. 

 Eumidia tubiformis — figs. 22, 23. 



Fig. 22. — Anterior aspect of parapodium L, showing dorsalmost and ventral- 

 most seta? in place, X 24. 



Fig. 23.— A seta from somite XXV, X 360. 

 Eulalia nigrimaculata — figs. 24-26. 



Fig. 24. — Anterior aspect of parapodium L, with dorsalmost and ventral- 

 most seta? in place, X 24. 



Fig. 25. — Outline of neuropodium showing tip of aciculum, X 56. 



Fig. 26. — Two views of articular region of seta from X, X 440. 

 Eulalia levicornuta — figs. 27-30. 



Fig. 27. — Anterior end, X 24. 



Fig. 28. — Anterior aspect of parapodium XXV, X 56. 



Fig. 29. — Same of parapodium LXXV, with dorsalmost and ventralmost 

 seta? in place, X 24. 



Fig. 30. — A seta from XXV; a, front view of articulation of same, X 440. 

 Eulalia bifoliata — figs. 31-34. 



Fig. 31. — Head from dorsum, X 24. 



Fig. 32. — Posterior view of parapodium XXXIII, without notostyle or 

 setae, X 56. 



Fig. 33. — Anterior view of parapodium XXXIX, without seta% X 56. 



Fig. 34. — Profile and rear views of articulation of seta from XXXIII, X 440. 



