NO. 1 HARTMAN : POLYCHAETOUS ANNELIDS 89 



twelfth setiger. The median tentacle has a ceratophore with 7 shorter 

 articles and a longer distal one ; its style reaches back to about the seventh 

 setiger. 



The first 2 pairs of parapodia are larger and longer than the others; 

 the first is directed forward. Branchiae on the first 4 setigers are shorter 

 than their respective dorsal cirri, but thereafter are as long or longer. 

 Ventral cirri are cirriform through 4 setigers, short and blunt on the 

 fifth, and padlike thereafter. Hooded hooks occur through the first 5 

 setigers; they are long and numerous in the first 3 setigers. The second 

 parapodium has 10 finer bidentate, 2 or 3 coarser bidentate (pi. 5, fig. 

 114), and rarely also a tridentate (pi. 5, fig. 113) hooded hook. By the 

 third setiger there are about 10 tridentate (pi. 5, figs. 116, 117), rarely 

 also a bidentate, and 2 or 3 coarser bidentate (pi. 5, fig. 115) hooks be- 

 low. A single, larger tridentate hook occurs near the middle of the fas- 

 cicle. N. elegans contrasts in this respect with N. iridescens, in which the 

 comparable hooks are almost altogether tridentate. Acicula usually num- 

 ber 3 in a parapodium ; they taper distally to fine points and are genicu- 

 late. Subacicular hooks are present from the tenth setiger. 



Tubes are not much larger across than the width of the occupant; 

 they consist of a thin, pale, limp, parchmentlike base, covered on the out- 

 side with coarse, dark-colored, sand particles or fine gravel. 



A^. elegans is clearly separable from N. iridescens (above), with which 

 it might be confused. The middle dorsum of segments is crossed by a dark 

 pigment band, whereas in A^^. iridescens the intersegmental groove is dark- 

 er than the middle of the segment ; anterior hooded hooks consist largely 

 of bidentate with fewer tridentate hooks, while in N. iridescens they are 

 almost entirely tridentate. Subacicular hooks are first present from about 

 the tenth setiger, in N. iridescens from the fourteenth or fifteenth seti- 

 ger; the occipital tentacles are proportionately shorter than those in A^. 

 iridescens. 



Distribution. — N. elegans has heretofore been recorded from Nanai- 

 mo, British Columbia (Berkeley, 1927, p. 408), south to Elkhorn 

 Slough, California (Berkeley, 1935, p. 692). These specimens originate 

 from near the Farallon Islands, California, in 37 fms. 



Nothria stigmatis (Treadwell) 

 Plate 11, Figs. 240-247 



Onuphis stigmatis Treadwell, 1922, pp. 176-178, figs. 22-34. 



Collections.— 2^5-3A (2); 1205-40 (10); 1241-41 (6); Pillar 

 Point, San Mateo County, California (many). 



