ANNELIDS OF FAMILY NEREIDAE HARTMAN 479 



Setae all composite ; f alcigerous neurosetae (fig. 52, c) with a short 

 appendage, the ratio of length to width being 10 : 1 or less. 



Holoti/pe.—U.S.^M. no. 20206. 



Locality. — Collected in quantity by Prof. S. F. Light, of the Uni- 

 versity of California, from Salton Sea, Calif. It is apparently a 

 common species there. Professor Light found great numbers of 

 dead individuals lying along the shore. Three weeks earlier, Dr. 

 J. E. Hill had collected numerous 3-5-segmented polytrochs from 

 Salton Sea, presumably of the same species. The suggestion of a 

 reproductive swarming is obvious. The living worms were present 

 in great numbers in the firm muddy sand, which forms the bottom 

 at least near the shore at Date Palm Beach where the collections were 

 made. Numerous young individuals were seen, and these like the 

 older ones were enclosed in a tube of debris and slime. 



Rertiarhs. — This species is closely related to Nereis (Neanfhes) 

 virens Sars. It is separable from that species in tiie following char- 

 acters: (1) It has a much greater number of paragnaths on both 

 maxillary and oral rings, (2) the shape of the parapodial lobes differs 

 strikingly, especially of the dorsal lobes, (3) parapodia lack para- 

 podial granules as tj^pical of N. virens Sars, and (4) the appendage 

 of the f alcigerous setae has a length to width ratio of 10 : 1 as against 

 15 : 1 or over, as typical for N. virens Sars. 



NEREIS (EUNEREIS) LONGIPES, new species 



Figure! 53 



Measurements. — Small. Length, 17 mm; width, 1 mm without, 

 2 mm with, parapodia at twelfth setigerous segment; number of 

 segments, 79. 



Description. — Prostomium (fig. 53, a) longer than wide, with nar- 

 rowed, subquadrangular, anterior portion, which is shorter than the 

 posterior portion; provided with four large red eyes with lenses. 



Antennae (fig. 53, a) almost half as long as prostomium; well 

 separated at their bases. 



Palpi moderately large, tapering distally; palpostyles bluntly 

 conical. 



Peristomium as wide as segment 2; dorsally with paired triangu- 

 lar projections extending forward over prostomium (fig. 53, a) ; lat- 

 erally with a groove that separates an anterior portion that turns 

 ventrally to produce fleshy lobes at sides of the oral opening, and a 

 posterior portion that forms a moderately thick lower lip; peris- 

 tomial cirri short (fig. 53, a), the longest extending beyond distal 

 ends of palpi, the shortest about one-third as long. 



Paragnaths completely lacking from the maxillary ring, also from 

 areas V and VI ; VII and VIII with six brown cones set in a trans- 

 verse row, two cones to each area. 



