1906.] NATURAL SCIENCES OF PHILADELPHIA. 259 



blunt beak. On somite V there are 13 in a torus, on somite VIII 

 11. The abdominal tori contain uncini of the form shown in fig. 66, 

 with quadrate bases and heads of much the form of the thoracic crochets 

 but strongly recurved on the base. They are more numerous than the 

 thoracic crochets, somite XXI containing 17. 



The tube is nearly transparent, little tortuous and almost free from 

 sand. 



The single specimen comes from Station 4,274, Alitak Bay, Kadiak 

 Island, 35 to 41 fathoms, on a bottom of gree» mud and fine sand. 

 A smaller specimen was taken at Station 4,253, Stephens Passage, 131 

 to 188 fathoms, rocks and broken shells. 



Explanation of Plates X, XI and XII. 



Plate X. — Notophyllum imbricatum — figs. 1-3. 



Fig. 1. — Dorsal view of head of type. X 13. 



Fig. 2. — Outline of parapodium of middle region, seen from in front. 

 X 13. 



Fig. 3. — Distal end of a neuropodial seta of average length. X 600. 

 Eulcdia quadrioculata — figs. 4-6. 



Fig. 4. — Dorsal view of anterior end of type. X 24. 



Fig. 5. — Posterior xiew of parapodium from somite XXV. x 32. 



Fig. 6. — End of an average seta from somite X. X 600. 

 Eulcdia longicomuta — figs. 7 and 8. 



Fig. 7. — Posterior view of parapodium from somite XXV of type. X 32. 



Fig. 8. — End of a seta from somite X. X 600. Some of the setae have 

 even longer appendages. 

 Pionosyllis magtiifica — figs. 9-11. 



Fig. 9. — Dorsal view of anterior end of type. X 32. 



Fig. 10. — Anterior \-iew of parapodium of somite XXV. X 32. 



Fig. 11. — End of a seta from the middle of a fascicle on XXV. X 600. 

 Stauronereis annulatus — figs. 12 and 13. 



Fig. 12. — Anterior end of cotype from above. X 82. 



Fig. 13. — A parapodium from somite XXV, anterior \'iew. X 82. 

 Brada pilosa — figs. 14-17. 



Fig. 14.— A medium-sized extended papilla from the dorsum of the middle 

 region, showing ring of adhering silt. X 113. 



Fig. 15. — An extended papilla from the ventral surface. X 113. 



Fig. 16. — A portion of the middle of a notopodial seta from XV. X 250. 



Fig. 17. — Exposed portion of neuropodial seta from XV. X 98. a, 

 portion of middle of the same. X 250. 



Plate XI. — Stauronereis annidatus — figs. 18-22. 



Fig. 18. — Distal portion of jaw from below. X 130. 



Fig. 19. — Forked seta from middle of notopodial fascicle of somite XXV ; a, 



another of the same slightly rotated and foreshortened. X 800. 

 Fig. 20. — Portion of the middle of a capillarv neuropodial seta from somite 



XXV. X 800. 

 Fig. 21. — A short-bladed compound neuropodial seta from the middle of 



the fascicle of XXV. X 800. 

 Fig. 22. — A long-bladed compound seta from the same somite. X 800. 

 Travisia pupa — fig. 23. 



Fig. 23. — A small portion from near the distal end of a notopodial seta 

 from the middle region. X 800. 

 Notomastus giganteus — figs. 24 and 25. 



Fig. 24. — An entire crochet from the middle of the body. X 333. 



