294 PROCEEDINGS OF THE ACADEMY OF [April, 



what chaff-like structures, the divided and densely fringed tips of 

 which often embrace the ends of the middle series of spines. 



The tubes of this species Fewkes describes as forming great masses 

 of agglutinated sand grains and shell fragments in the caverns of 

 wave-worn cliffs. Those of S. cementarium, so far as known, occur 

 singly or in small groups attached to shells and stones. Which one 

 of these species, if either, was described by Baird under the name of 

 S. saxicava it is impossible to determine from the brief description. 

 So far as it goes the description fails to fit either, and it seems probable 

 that a third species is represented on this coast. 



Sabellaria cementarium Moore. 



Sabellaria cementarium Moore, Proc. Acad. Nat. Sci. Phila., 1906, pp. 24S- 

 253; PI. XII, figs. 45-51. 



Two specimens among S. californica from "big tide pool," Monterey 



Bay, June 20, 1905. 



Explanation of Plates VII, VIII, IX. 



Plate VII. — Trypanosyllis intermedia — figs. 1 and 2. 



Fig. 1. — End of seta from somite X, X 360. 



Fig. 2. — Same from somite L, X 360. 

 Phyllodoce medipapittata — figs. 3 and 4. 



Fig. 3. — Parapodium from somite X, X 24. 



Fig. 4. — Seta from somite XXV, X 360. 

 Eunice paloloides — figs. 5-7. 



Fig. 5. — Compound seta from somite C, X 440. 



Fig. 6. — Ventral view of mandibles, X 9. 



Fig. 7. — Dorsal view of maxillae, X 9. 

 Marphysa stylobranchiata — figs. 8-12. 



Fig. 8. — Simple acute seta from somite XXV, X 250. 



Fig. 9. — Simple pectiniform seta from same, X 440. 



Fig. 10. — Compound seta from same, X 440. 



Fig. 11. — Mandibles from ventral side, X 24 



Fig. 12. — Maxillse from dorsum, X 24. 

 Marphysa californica — figs. 13-20. 



Fig. 13. — Simple seta from dorsal portion of upper tuft of XXV, X 250. 



Fig. 14a and b. — Two forms of simple pectiniform setse from somite XC, 

 X 440. 



Fig. 15. — Compound seta with appendage of moderate length from somite 

 XXV, X 360. 



Fig. 16. — Hooded crochet from somite C, X 360. 



Fig. 17. — Ventral view of mandibles, X 9. 



Fig. IS. — Dorsal view of right mandible, X 9. 



Plate VIII. — Marphysa californica. 



Fig. 19. — Dorsal view of maxillcc of left side in normal relation, X 9. 



Fig. 20. — Dorsal view of right maxillae partly separated, X 9. 

 Drilonereis nuda — figs. 21-23. 



Fig. 21. — Parapodium C, anterior face, X 83. 



Fig. 22.— Seta from middle of same, X 360. 



Fig. 23. — Dorsal view of jaws, X 24. 

 Stauronereis moniloceras — figs. 24-29. 



Fig. 24. — Compound seta from parapodium XXV, X 440. 



Fig. 25. — Tip of a coarser simple seta from XXV, X 600. 



