340 PROCEEDINGS OF THE ACADEMY OF [April, 



end a short, blunt flat cirrus. Parapodium II scarcely differs from the 

 others. 



Notocirrophores arising almost directly behind notopodia, prominent, 

 suberect, reaching level of neuropodial acicular process, cylindroid 

 with somewhat tumid base. Styles (fig. 8) long and slender, reaching 

 to middle of dorsum and far beyond setae tips, like medium tentacle 

 in all respects. Those at the caudal end much elongated and slender. 



Acicula single, deep brown, very stout, tapered to acute, pale tips 

 which project slightly beyond the acicular processes in both rami. 

 Neuropodial setse (PI. XXVIII, figs. 9 and 10) reduced in number, usually 

 two supra-acicular and six subacicular series of two to four each on 

 middle segments. All stout, deep yellow, prominent, with the thick- 

 ened terminal portion strong and long (generally about two-fifths of 

 exposed length); transverse pectinations numerous and close but 

 exceedingly fine and on many setae quite obsolete, apparently as the 

 result of wear; smooth tip rather long (2-3 times diameter of seta) 

 stout, curved and lacking an accessory tooth (fig. 10). Notopodial 

 setae also comparatively few, forming an irregular loose bundle, deep 

 yellow, about as stout as the neuropodials but much shorter, nearly 

 straight, tapered to blunt, smooth tips and with the trans verse rows 

 of spines nearly or quite obsolete (figs. 11 and 12). Both kinds of 

 setae resemble those figured by Mcintosh for Polynoe enplectellce but 

 are stouter. 



Elytra attached with moderate firmness, of delicate gelatinoid 

 consistency and in their evidently much contracted state shrunken 

 away from the middle line and having a deep central depression 

 and more or less folded and frilled raised margins. Probably they are 

 in life flat and overlap widely. So far as can be determined the first 

 is circular, the others more or less broadly reniform. They are color- 

 less, translucent and totally without marginal cilia or obvious tubercles 

 on the smooth dorsal surface. Under the microscope an area of rather 

 closely placed minute horny tubercles appears behind the hilum and 

 similar tubercles are scattered widely over the entire surface. 



Except for a slight purplish brown color of the head the entire 

 worm is colorless. 



Station 4,537, Monterey Bay, off Point Pinos Light, 861-1,062 

 fathoms, hard sand and mud. Commensal on Holothuria sp. (four 

 specimens). 



Harmothoe (Lagisca) multisetosa Moore. 



Lagisca multisetosa Moore, Proc. Acad. Nat. Sci. Phila., 1902, pp. 267-269, 

 PI. XIV, figs. 29-36. 



The specimens in the collection referred to under this and the 



