NO. 1 HARTMAN : POLYCHAETOUS ANNELIDS 93 



Second segment (first setlgerous) provided with parapodia that are 

 less than half as long as those immediately following. It has a stout, 

 subulate ventral cirrus on a well-developed cirrophore (pi. 28, fig. 

 328) and a globular dorsal cirrus. The third segment has a stout dorsal 

 cirrus and a globular ventral cirrus (pi. 28, fig. 327). From the fourth 

 segment, the dorsal and ventral cirri are globular, with a terminal fila- 

 ment (pi. 28, fig. 331). 



In addition to dorsal and ventral cirri, some individuals have a long, 

 cirriform appendage (nephridial papilla?) inserted on the ventral body 

 wall near the point where the foot joins the body (pi. 28, fig. 331). A 

 similar structure has been observed in some individuals of the nearly 

 related Pisione oerstedi Grube. When present, it occurs on all segments 

 from the fifth, posteriorly. 



Each setigerous segment has yellow dorsal and ventral acicula. That 

 of the second segment differs slightly in shape from those more pos- 

 teriorly. It is somewhat cuspidate (pi. 28, fig. 330). From the third 

 segment a stout, blunt aciculum emerges from the distal end of the 

 parapodium (pi. 28, fig. 333), and lies just dorsal to the setal fascicle. 

 Composite setae resemble one another throughout. The shaft is pro- 

 vided with 2 longitudinal rows of spinelets, on the dorsal or cutting 

 edge; the appendage is falcate, with a terminal fang and a single row 

 of fine spinelets along the cutting edge (pi. 28, figs. 332, 330). A 

 typical median parapodium has an embedded dorsal aciculum, 2 ventral 

 acicula of which the dorsalmost emerges from the neuropodium, and 

 about 4 composite setae inferior to the aciculum (pi. 28, fig. 331). 

 Anal cirri, if originally present, have been lost from the collections. 



Holotype.— AHF no. 20. 



Distribution. — Callao, Peru; Independencia Bay, Peru. Intertidal 

 to 8 fms. 



