NO. 5 HARTMAN : POLYCHAETOUS ANNELIDS 495 



a pair of short, blunt palpophores that are attached anteroventrally. 



The peristomium is a simple ring that is as long as the next segment 

 but narrower and deeply incised middorsally where the prostomium joins 

 it. At its sides it is provided with 2 pairs of short, conical, papillated 

 tentacular cirri of which the dorsal ones are slightly the larger. 



The proboscis was not everted in the single individual which retained 

 it; it is presumed to be globular, as in P. berkeleyi and other species of 

 the genus. 



The second, or first setigerous, segment resembles those farther back 

 except that its dorsal cirri are larger. It is provided with single acicula 

 in both notopodia and neuropodia; its fascicles of setae resemble those 

 farther back. From the next segment the notopodia have a reddish 

 brown, pigmented area on the anterior side; this spot comes to be more 

 conspicuous farther back and is continued medially and posteriorly as a 

 dark, reddish, saddlelike area over the notopodial ridge (pi. 60, fig. 5). 

 It may be glandular in function. 



Typical parapodia have a short, thick notopodium with conical, papil- 

 lated dorsal cirrus and a slender, translucent, embedded aciculum. Neuro- 

 podia consist of a smaller, conical, smooth ventral cirrus and a short, 

 truncate, setigerous portion with a triangular, acicular lobe that projects 

 laterally from between the short presetal and postsetal lobes. Neuro- 

 acicula are thicker than notoacicula but also translucent yellow and com- 

 pletely embedded in the parapodial tissue. 



Neurosetae consist of a single kind but are of varying lengths; the 

 longest and slenderest are in the superiormost part of the fascicle. They 

 number 16 to 20 in a bundle in median parapodia. All are slender and 

 knifelike with a distal, bifurcated tip. The shaft is nearly cylindrical; 

 the blade is triangular with the thinnest portion at the dentate edge and 

 the teeth are disposed in a single row (pi. 60, figs. 3, 4). The distal end 

 terminates in a large, recurved main fang and a smaller, straighter tooth. 

 In frontal view it is much like that in P. berkeleyi (pi. 59, fig. 5). 

 Pointed or furcate setae have not been identified and are believed to be 

 absent. 



The posterior end, complete in the largest individual, consists of many 

 closely crowded, flattened segments that taper rapidly to a narrow, 

 pygidial ring. This is thickened and papillated; it has a terminal anal 

 aperture. No processes are present as in P. berkeleyi (pi. 59, fig. 3), but 

 it is not known that they have not been lost. 



