COMPLETE HARTMAN: POLYCHAETES FROM CALIFORNIA 121 



The oral apparatus consists of a pair of thick, longitudinally grooved 

 palpi, inserted at the sides of the prostomium, and 4 pairs of branchiae, 

 inserted in a semicircle about the upper base of the prostomium (PL 24, 

 fig. 2). The prostomium is a small papillar mound, provided with 4 

 large eyes in quadrate arrangement (PI. 24, fig. 3). 



The cephalic cage is formed by the setae of the first 3 segments 

 directed forward. The annulated structure of one from the first segment 

 is shown in PI. 24, fig. 7 for the base, the middle region, and near the 

 tip. 



Falcigerous neuropodial hooks are first present in the fourth setigerous 

 segment. Typically they number 2 or 3 in a parapodium. They vary 

 from slenderer (PL 24, fig. 6) to somewhat thicker (PL 24, fig. 4). The 

 companion setae from the same segment are distally straight (PL 24, 

 fig. 5). Nephridial pores occur on the fifth and sixth setigerous segments, 

 located at the anterior end of the segment, just within the neuropodial 

 base. 



Pherusa papillata occurs commonly from Alaska to southern Cali- 

 fornia, in littoral zones. In the southern end of its range it is largely 

 replaced by Pherusa neopapillata (see below). 



Pherusa neopapillata, new species 

 Plate 25, figs. 1,2; plate 26, figs. 1-7 



Collections. The type is selected from VELERO IV Sta. 1205, 

 other types from 1136 and 5102; many other specimens come from 

 shelf depths of southern California. 



This species is somewhat smaller than Pherusa papillata (see above) ; 

 adult specimens measure 40 mm long for 43 setigerous segments, or 45 

 mm long for 54 segments. The body is uniformly and closely papillated 

 (PL 25, fig. 1), most intensely on the dorsal and less so on the ventral 

 side. The papillae are elongate, taper distally, but with the attached 

 silt they appear oval to globular, and account for a densely papillated 

 epithelium. 



In its prostomial parts and oral tentacles, this species resembles P. 

 papillata (above). The paired palpi are large and thicker than the 

 tentacles ; they are attached at the sides of the prostomium ( PL 26, 

 fig. 1 ) . The tentacles or branchiae number 4 pairs and are inserted in 

 a semicircle above the prostomium ; usually 2 additional smaller lobes 

 on a side are visible (PL 26, fig. 2). The prostomium is a small elevated 

 lobe and has 4 eyes in quadrate arrangement. 



