502 proceedings of the academy op [may, 



Explanation of Plates. 



Plate XXXVII. 



Diopatra californica, Figs. 1 to 9. 



Fig. 1 . — Large guarded and hooked seta from the middle of the third para- 

 podium. X 250. 

 Fig. 2. — Small one from ventral bundle of the same. X 250. 

 Fig. 3. — Simple slender seta from the same. X 250. 

 Fig. 4. — Broader winged seta from the tenth parapodium. X 250. 

 Fig. 5. — Spatulate and pectinate seta from the same. X 440. 

 Fig, 6. — Crochet-shaped aciculus from the twenty-fifth parapodium. X 250. 

 Fig. 7. — Simple pointed aciculus from L. X 250. 

 Fig. 8.— Simple blunt aciculus from LXXV. X 250. 

 Fig. 9. — Jaws, all parts in dorsal view; on the left the maxillae are shown 

 in situ, on the right the plates are separated. X 8, 



Eunice biannulata, figs. 10 to 18. 



Fig. 10. — Compound seta from second parapodium. X 250. 



Fig. 11. — Compound seta from somite LXX. X 250. 



Fig. 12. — Slender seta from second parapodium. X 250. 



Fig. 13. — Pointed aciculus from the first parapodium. X 250. 



Fig. 14. — Flattened aciculus from X. X 250. 



Fig. 15. — Dorsal aciculus from LXV. X 250. 



Fig. 16. — Dorsal aciculus from LXX. X 250. 



Fig. 17. — Hooked and guarded ventral aciculus from LXV. X 250. 



Fig. 18. — Dissected jaws viewed from above. X 12. 



Lnmbriconereis erecia, figs. 19 to 22. 



Figs. 19, 20, and 21.— Anterior views of the 10th, 100th and 250th parapodia 



respectivelv. X 33. 

 Fig. 22.— Mandible. X 8. 



Plate XXXVIII. 



Lumhriconereis erecta, figs. 23 to 25. 



Figs. 23 and 24. — Slender winged seta from the 10th and 25th parapodia 



respectively. X 130. 

 Fig. 25. — Hooded crochet from middle of the 10th parapodium. X 250. 



Cirratulus spirabranchus , figs. 26 and 27. 



Fig. 26. — Outline of side of 50th setigerous somite. X 24. 

 Fig. 27. — Same of 150th setigerous somite. X 24. a, ventral, and b, dor- 

 sal spine. X 55. 



Cirratulus luxuriosus , figs. 28 to 31. 



Fig. 28. — Outline of side of 50th setigerous somite. X 24. 



Fig. 29. — Outline of side of 150th setigerous somite. X 24. 



Fig. 30. — Outline of side of 150th setigerous somite. X 24. 



Fig. 31. — A spine from the ventral bundle of the 50th somite. X 55. 



Maldane disparidentata, figs. 32 to 35. 



Fig. 32. — Outer end of a crochet from the 2d setigerous somite. X 250. " 

 Fig. 33. — Outer end of a crochet from the 14th setigerous somite. X 250. 

 Fig. 34. — Front view of the last. X 250. 

 Fig. 35. — Portion of a spirally fringed seta from the 14th somite. X 440. 



