19U7.] NATURAL SCIENCES OF PHILADELPHIA. 207 



Pohjdora anoculala — figs. 7 to 17. 



Fig. 7. — Dorsal aspect of head and first G setigerous somites, one tentacular 

 cirrus in place. X 50. 



Fig. 8. — Dorsal aspect of head and 2 setigerous somites of another specimen. 

 X 5G. 



Fig. 9. — Ventral aspect of same. X 56. 



Fig. 10. — Dorsal aspect of pygidium and posterior somites. X 56. 



Fig. 11. — Ventral aspect of pvgidium. X 56. 



Fig. 12.— Parapodium XV. "^X 83. 



Fig. 13. — Dorsal (a) and \-entral (b) notopodial seta? from XV. X 440. 



Fig. 14. — Strongly bent seta from dorsal tuft of YI. X 440. 



Fig. 15.— Guard seta from VI. X 440. 



Fig. 16. — Three spines from VI, a and 6 from young, c from adult (type) 

 specimen. X 440. 



Fig. 17.' — Profile and face ^'ie\vs of neuropodial crochet from XV. X 600. 

 Pohjdora colonia — figs. IS to 23. 



Fig. 18. — Dorsal aspect of head and first 6 setigerous somites, one tentacular 



cirrus in place. X 56. 

 Fig. 19. — Dorsal (a) and ventral (6) notopodial seta? from XV. X 440. 

 Fig. 20. — Anterior and ventral ■view, showing all of the spines and setse of 



one side of "\'I under shght pressure, a the reverse or postero-dorsal 



aspect of the end of one of the spines. X 440. 

 Fig. 21. — Profile of one of the spines from somite VI of a larger specimen. 



X 440. 

 Fig. 22. — Profile and face views of a crocliet from XV. X 600. 

 Fig. 23. — "\^ariati()ns in the form of the spines on somite VI of Pohjdora 



anoculata. X 440. 



Pl.^te XVI. — Magelona rosea — figs. 24 to 30. 



Fig. 24. — Dorsal aspect of head and anterior region, showing the right 



tentacular cirrus in outUne and the left complete. X 9. 

 Fig. 25. — 'N'entral aspect of anterior end, showng bases of tentacular cirri, 



partly everted proboscis and ventral plates. X 24. 

 Figs. 26-29. — Outlines of parapodia X from the anterior side, all except 



fig. 27 ^^^th sette or crochets. X 56. 

 Fig. 30. — Two crochets from somite L, striations omitted from one. X 440. 



Spionides japonicus — figs. 31 to 34. 



Fig. 31. — Dorsal aspect of head, lacking tentacular cirri, and first two 



setigerous somites with setse. X 24. 

 Fig. 32. — Anterior aspect of parapodium XV, -vsith setie, the concealed 



portion of the gill sho'mi in dotted outline. X 24. 

 Fig. 33. — A pair of middle notopodial setse from XV. X 98; a, a small 



portion, X 440. 

 Fig. 34. — An entire crochet from tlie neuropodium of XL, X 2.50; and distal 



end of the same, X 440. 



