NO. 1 HARTMAN : POLYCHAETOUS ANNELIDS 63 



Parapodial ctenidia are present from the fourth parapodium and 

 occur in threes, the dorsalmost the smallest (pi. 14, fig. 167). Elytral 

 cirri (=branchiae) are long, cirriform, directed ventrally and recurved 

 inward. They extend distally to about the middle of the parapodial base. 

 The whorl about the neuroacicular lobe, from which the median neuro- 

 podial setae arise, is closely surrounded by a fringe of elongate papillae. 

 The inferiormost setae are ventral to the papillar whorl (pi. 14, fig. 

 175). A row of slenderer papillae borders the upper lobe where the 

 notopodial setae emerge from the notopodium. The ventral cirrus has a 

 basal thickening (pi. 14, fig. 167). 



The first elytrum is large, with an anterior prolongation that fits 

 snugly about the sides of the prostomium. Others are deeply excavate 

 at their anterior margins. On their proximal margins they are smooth, 

 delicate; laterally there are long fringes, some of which extend over the 

 sublateral margin (pi. 14, fig. 171). The exposed surface is more or 

 less covered with microtubercles subequal in size (pi. 14, fig. 172). 



Neuropodial setae include (1) spinose, simple, superiormost (pi. 14, 

 fig. 174), accompanied by (2) a few long jointed, composite setae, (3) 

 median and inferior, long jointed, slender, bifid composite setae (pi. 14, 

 figs. 168, 169). There are no stout, falcigerous median setae such as 

 characterize S. fusca Johnson (see above). Notopodial setae are closely 

 serrated (pi. 14, fig. 173). 



Distribution. — California; British Columbia; Carros Island, Mexico; 

 San Miguel Island, California. Subintertidal to 30 fms. 



Sthenelais variabilis Potts, var. colorata Monro 

 Plate 13, Figs. 163-166 



Sthenelais variabilis Potts, 1910, p. 349. 



Sthenelais variabilis, var. colorata Monro, 1924, pp. 52-53; 1933, pp. 

 14-16, fig. 7. 



Collections.— n6-3Z, 250-34, 450-35, 451-35, 470-35. 6 specimens. 



These specimens differ from S. fusca Johnson (see above) most 

 notably in their much smaller size. An egg-laden female (450-35) con- 

 sisting of 42 anterior segments is only 25 mm long and 3.5 mm wide. 

 The first elytrum is about as broad as long and suborbicular. The in- 

 feriormost neuropodial setae are inserted dorsal to the ventral parapodial 

 fringe (pi. 13, fig. 166) and the notopodial fringe is terminal rather 

 than oblique in its insertion. The posterior margin of the elytra is neatly 



