1911.] NATURAL SCIENCES OF PHILADELPHIA. 315 



Color at anterior end pale yellow, fading out and leaving the poste- 

 rior end nearly colorless and much more translucent. A rather con- 

 spicuous series of median dorsal brown spots begins on VII and con- 

 tinues to the caudal end. On some of the specimens the anterior 

 spots are double. The only other color is a slight anterior cuticular 

 iridescence, the obscure eye-spot (?) on each side of the prostomium 

 and a duskiness of certain of the palisades of setae. 



Most of the examples are sexually mature, both males and females 

 occurring, the type being of the latter sex. A specimen from station 

 4,306 is noteworthy because of the occurrence of abnormalities, the 

 gills of many of the anterior segments being bifid and the postsetal 

 lobes more or less divided into slender often lacinated processes. 



Stations 4,306, off Point Loraa Lighthouse, vicinity of San Diego > 

 207-497 fathoms, green mud, fine sand and gravel; 4,327, off Soledad 

 Hill, Point La Jolla, vicinity of San Diego, 263-330 fathoms, soft 

 green mud ; 4,339 (type), off Point Loma Lighthouse, 241-369 fathoms, 

 green mud. 



Explanation of Plates XV-XXI. 

 Unless stated otherwise, all drawings are made from the types. 



Plate XV. — Chloeia pinnata, figs. 1-6 (from cotype, station 4,475). 



Fig. 1. — Posterior ventral bifid notopodial seta from X, X 98. 



Fig. 2. — Tip of serrated notoseta from X, X 250. 



Fig. 3. — Tip of spurred anterior notoseta from near notocirrus of X, X 98. 



Fig. 4. — a and b, respectively, tips of stout and slender neurosetae from X, 

 X 250. 



Fig. 5. — Tip of anterior neuroseta from X, X 98. 



Fig. 6. — Same of somite I, X 250. 

 Euphrosyne limbata, figs. 7-11. 



Fig. 7. — Fifth gill from somite X, incomplete, X 40. 



Fig. 8. — Main division of 3d gill from X, X 56. 



Fig. 9. — Large notoseta of X, X 98. 



Fig. 10. — Ventral neuropodial of X, X 98. 



Fig. 11. — Dorsal neuropodial of X; a, end of another with wider angle of 

 divergence of the spur, X 98. 

 Euphrosyne dumosa, figs. 12-17. 



Fig. 12. — Gill from somite XV of cotype (station 4,470), X 56. 



Fig. 13. — Large smooth notopodial seta from 2d row of X, X 98. 



Fig. 14. — Small same from 3d row, X 98. 



Fig. 15. — Bifid serrate notoseta from X, X 98; a, tip of same, X 250. 



Fig. 16. — Ventral neuroseta from XV, X 98. 



Fig. 17.— Dorsal same, X 98. 



Fig. 18. — Nereis procera, parapodium L of male epitoke from station 

 4,355, X 40. 



Fig. 19. — Platynereis agassizi, two mature eggs from coelom of epitoke 

 from station 4,355, X 56. 

 Eunice multipectinata, figs. 20-23. 



Fig. 20. — Parapodium and gill from somite XXV, X 17. 



Fig. 21.— Compound seta from XV, X 250. 



Fig. 22.— Pectinate seta from L, X 440. 



Fig. 23. — A rather slender ventral crochet from CL, X 250. 



