190 CALIFORNIA ACADEMY OF SCIENCES. [Proc. 3D Ser. 



EXPLANATION OF PLATE VI. 

 Figs. 17-23 illustrate Palmyridae. 



Fig. 17. A middle parapod of Chrysopetalum occidentale as seen in pro- 

 file under pressure of cover glass, which brings the circlet of palea? nearly 

 into one plane; X 78.75. 



Fig. 18. Palea of the same; X 300. 



Fig. 19. Seta? from ventral fascicle of the same; a, one of the uppermost; 

 b, one of the lowest of the series; X 510. 



Fig. 20. Heteropale bellis, gen. et sp. nov. Anterior extremity, including 

 head and first four setigerous somites. The palea? of the third parapod on 

 the right side, and of the fourth somite, are omitted. In glycerine; X 82.5. 



Fig. 21. A middle parapod of the foregoing; posterior aspect. In glycer- 

 ine; X 97.5. 



Fig. 22. One of the largest and most external of the broad palea? of the 

 same. In glycerine; X 300. 



Fig. 220. Narrow, lateral palea of the same; X 300. 



Fig. 23. Setae from ventral fascicle of//, bellis; a one of the highest; b one 

 of the lowest of the series. In glycerine; X 510. 



Figs. 24-29 illustrate Polynoidae. 



Fig. 24. Polyno'e (Halosydna) brevisetosa (Kinberg). Dorsalaspect of an- 

 terior and posterior extremities of a young specimen 27 mm. long. As 

 often happens, the elytra are lax, leaving the head and part of the back 

 uncovered; X 3. (Drawn without camera from a specimen preserved in 

 formalin. ) 



Fig. 25. Dorsal aspect of seventeenth parapod of Harmotho'e crassicir- 

 rata, sp. nov., right side; X circa 18. (Drawn from life without camera 

 lucida, but accurately as possible.) 



Fig. 26. Posterior aspect of twenty-second (elytrophorous) parapod of the 

 same, formalin specimen. Position of acicula? indicated as seen after clearing 

 and mounting in balsam; X 19.5. 



Fig. 27. Elytron from right side, second pair, of Harmotho'e hirsuta, 

 sp. nov. The elytron has a fringe of "cilia" on two-thirds of its periphery 

 (external and posterior borders). The denticulate tubercles are enormously 

 large along posterior margin, each arising from a "space"; X 12.75. 



Fig. 28. The same. A small portion of elytron, more magnified. From 

 the antero-lateral border, where the "cilia" begin, and where the spaces, each 

 with its tubercle, are most distinct. One "space" filled in with the pig- 

 mented cells; the others left blank. Transmitted light; glycerine; X no. 



Fig. 29. A single "space" near margin of same elytron, with a large 

 tubercle. Transmitted light; glycerine; X 82.5. 



