1910.] , NATURAL SCIENX'ES OF PHILADELPHIA. 367 



rather conspicuous half-rouiul ensheathinf^ plates with entire or nearly 

 entire margins along one side. Neuropodial setae (fig. 55) are \ery 

 numerous and form dense brush-like bundles as in P. remigata but the 

 setffi are considerably stouter than the notopodials, with broad, paddle- 

 like distal expansions (fig, 56) having simple marginal serrations which 

 become rather coarse toward the subacute tip. 



The only pigment is a little of reddish brown color on the eh-trophores. 

 Station 4,407, off Santa Catalina Island, 334-600 fathoms, gray sand 

 and rocks (type only). 



Polyno6(T) aciculata sp. nov. PI. XXXI, figs. 57 and 58. 



A single very imperfect specimen, with 18 setigerous segments and 

 measuring 9 mm. long and 7 mm. between the setae tips, represents 

 this species. 



Prostomium distorted, much contracted and bent dorsad by the 

 protruded proboscis. It is about twice as wide as long and deeply 

 divided by a median fi.ssure into a pair of anteriorly divergent, roiuided 

 lobes from between which a small cylindrical median ceratophore. 

 from which the style has been lost, arises. The lateral tentacles and 

 palps also are missing and there is no trace of pigmented eyes. A 

 single ventral tentacular cirrus remains and is a slender, tapered style 

 without subterminal thickening and about twice as long as the width 

 of the prostomium. 



The body is slight 1}' depressed and somewhat fusiform, the segments 

 well defined and rather longer than usual, most of them being nearly 

 half as long as wide. Ehi:rophores on II, IV. ^^ and alternate seg- 

 ments to XVH, small, low, at base of parapodia and widely separated 

 from notopodial ramus. Dorsal tubercles very small slightly hooked 

 laterally, situated in line with elytrophores. Xephridial papUlae 

 not obvious. 



Parapodia largely lost or injured and those remaining evidently 

 considerably retracted (PI. XXXI, fig. 57). Their length does not 

 exceed the width of the segments and they are strongly compressed 

 and about as deep as long, the rami very unequal. Xeuropodium 

 with steep dorsal border and truncate end, the presetal lip of which is 

 produced into a long, stiff, acute, spine-like acicular process which 

 appears to lack a terminal cirrus. Xotopodium a contracted achaetous 

 subconical tuV)ercle prolonged into an acicular process similar to that 

 on the neuropodium and nearly as long, usually slighth' curved. 



Notocirrophores (fig. 57) arising in contact with the notopodial 

 tubercle far out or parapodium, prominent and rather long: noto- 



