384 PROCEEDINGS OF THE ACADEMY OF [April, 



the two fascicles of setae on all segments. The fibers are nearly or 

 quite colorless, smooth, very fine, long and of nearly uniform diameter 

 but taper to abruptly hooked tips (fig. 90). Lateral tufts of fibers 

 arising below the notopodial setae are rather sparse, not much longer 

 than the neuropodial setae and hang down between the parapodia. 

 They are much coarser than the felt fibers, especially at the base from 

 which they taper to fine straight tips (fig. 91). They are arranged in 

 regular rows like the large setae. Usually they are very heavily coated 

 with silt but when this is cleaned off they exhibit none of the brilliance 

 of color of many species and scarcely a trace of iridescence. The 

 somewhat roughened surface is covered with a fine hairiness which 

 many result from a mucous coat or the separation of the more super- 

 ficial constituent fibers (fig. 97). In any case this feature seems to 

 insure the adhesion of silt. 



No color other than the extraneous ferruginous incrustation. One 

 specimen dissected contained strings of large ova. None has the 

 proboscis protruded. 



Stations in Monterey Bay, 4,446, off Point Pinos Light-house, 

 52-59 fathoms, green mud ; 4,457, same locality, 40-46 fathoms, dark 

 green mud; 4,464, same locality, 36-51 fathoms, soft dark gray mud; 

 4,467, off Santa Cruz Light-house, 51-54 fathoms, soft dark green mud 

 (cotypes); 4,468, same locality, 51-309 fathoms, fine sand (cotypes); 

 4,481, same locality, 45-50 fathoms, hard sand; 4,482, same locality, 

 43-44 fathoms, soft green mud (type and cotypes) ; 4,485, same locality, 

 39-108 fathoms, soft green mud and sand; 4,550, off Point Pinos 

 Light-house, 50-57 fathoms, green mud and rocks. 



This plainly colored but handsome and very interesting species 

 is confined, so far as known, to the waters of Monterey Bay where 

 it appears to be quite plentiful, the collection yielding twenty-six 

 specimens. With the exception of one doubtful record of depth 

 (51-309 fathoms at station 4,467) it was taken practically exclusively 

 at depths varying little from fifty fathoms and chiefly on muddy 

 bottoms, though a few occurred on sand. 



Though resembling A. japonica, A. negligens and A. refulgida in 

 many respects and especially in the long, soft, hooked notopodial 

 setae, this species is easily distinguished from all of them by the large 

 number and rich chestnut color of these setae, and in addition from 

 A. japonica by having a short and clavate, tentacular style instead 

 of an elongated tapered one, and from A. refulgida by having densely 

 hairy instead of smooth neuropodial setae and instead of brilliant 



