194 CALIFORNIA ACADEMY OF SCIENCES. [Psoc. 3D See. 



EXPLANATION OF PLATE VIII. 



Fig. 46. Anterior aspect of twentieth left parapod of Polynoe brevisetosa 

 (Kinberg). Viewed as an opaque object, but the position of the aciculae in- 

 dicated by dotted lines. Dorsal seta; short and small; X 14.8. 



Fig. 46a. Tip of seta from the ventral fascicle of the same; X 228. 



Fig. 47. Anterior aspect of twenty-second parapod of Polynoe reticulata; 

 X 14.8. 



Fig. 47a. Tip of ventral seta of Polynoe reticulata, from about the middle 

 of the series; X 228. 



Fig. \~ib. A group of one long and two short seta; in situ in dorsa' 

 ramus of thirteenth foot of the same; X 228. 



Fig. 48. Posterior aspect of forty-fifth foot of Polynoe gigas ; X 14.8. 



Fig. 48a. Seta-tip from about the middle of the ventral fascicle, thirty- 

 second foot, of the foregoing; X 22S. 



Fig. 486. Tip of stout, uppermost seta of ventral fascicle of the same. 

 Dark brown and nearly opaque. The tooth is worn off; X 22S. 



Fig. 49. Sixty-ninth and seventieth somites of Polynoe gigas. The sixty- 

 ninth has an elytrophore on the right, a dorsal cirrus on the left; X 1.8. 



Fig. 50. Anterior aspect of twenty-fourth foot of Polynoe pulchra. The 

 dorsal ramus has only a single seta (often achaetous); X 14.8. 



Fig. 50a. Tip of a ventral seta of the same; moderately hooked; x 22S. 



Fig. $ob. Tip of a dorsal seta of the same; X 228. 



Fig. 51. Anterior aspect of eighth parapod of Polynoe (Halosydna) lordi 

 (Baird). Dorsal ramus achaetous; ventral ramus with five blunt, slightly 

 curved setae above the acicula, and a fascicle of hooked seta; below; X 14.S. 



Fig. 51a. Tip of a hooked seta from lower portion of ventral series; X 22S. 



Fig. 516. Tip of a blunt seta from upper portion of ventral series; X 228. 



Fig. 52. Profile view of fifteenth foot of Polynoe (Halosydna) fragihs 

 (Baird). Dorsal setae present, seven or eight in number. Nascent setae 

 imbedded within the ventral ramus represented by dotted lines; X 14.8. 



Fig. 52a. Ventral seta-tip from seventeenth parapod of Polynoe fragilis. 

 In glycerine; X 228. 



Fig. 52^. Tip of seta from dorsal ramus of the same; X 228. 



Fig. 53. Anterior profile view of tenth foot of Harniothoe hirsuta. 

 Balsam preparation; X 14.S. 



Figs. 53a, b. Tips of one of the longest and one of the shortest of the 

 ventral setae of the preceding. The difference in numbe r of the serrations is 

 striking; X 228. 



Fig. 53c Seta-tip from the dorsal ramus of the same; X 228. 



Fig. 54. Elytron of Harmotho'e crassicirrata. Glycerine preparation, 

 seen by transmitted light; X 7.23. 



Fig- 55a. Entire dorsal seta from twenty-third foot of H. crassicirrata; 

 X 60. 



Fig. 55^. Tip of the same, more magnified (the serrations are represented 

 rather too distinctly); X 228. 



Fig- 5h c - An average seta-tip from ventral fascicle of the foregoing; X 228. 



