NO. 3575 BATHYAL POLYNOIDS — PETTIBONE 5 



to about segment 9, according to Treadwell, 1923). Ceratophores of 

 lateral antennae formed by continuations of anterolateral borders of 

 prostomium; styles cylindrical, tapering distally to slender tips, with 

 slight subterminal enlargements. Paired, thin, flattened, subtriangu- 

 lar processes or antennal scales attached between bases of ceratophores 

 of lateral antennae and median antenna; antennal scales broad basally, 

 tapering to blunt tips, tending to curl around basal parts of lateral 

 antennae (antennal scales sometimes broken off but scars of attachment 

 visible) . Paired, very long, tapering, smooth palps. 



First or tentacular segment (figs, la, 6) dorsally forms short ring, 

 projecting lateral to prostomium, achaetous, with 2 pairs tentacular 

 cirri; cirrophores large, inflated; styles long, smooth, delicate, with 

 attenuate tips; a bidbous facial tubercle between bases of palps, con- 

 tinuous with a longitudinal ridge on upper lip. Second or buccal 

 segment with first pair ely trophores ; parapodia rudimentary, achae- 

 tous; with dorsal, low, slightly bilobed, transverse nuchal fold between 

 ely trophores ; forms posterior lip of mouth ventrally; ventral or buccal 

 cirri with large inflated cirrophores, with styles long, similar to ten- 

 tacular cirri. Third segment with setigerous biramous parapodia not 

 especially elongated. Beginning with segment 4, parapodia elongated. 

 Ventral cirri on segments 3-5 extend beyond tips of neuropodia. On 

 remaining segments, ventral cirri smaller, subulate, in middle of 

 elongated neuropodia (figs. 2a,b). 



Parapodia (figs. 2a,b) elongated, inflated, thin walled, flattened 

 transversely, subbiramous. Notopodia small lobes on anterodorsal 

 faces of elongated neuropodia, inflated basaUy with elongated digiti- 

 form acicular processes, with small bundles of notosetae (easily broken 

 and may be overlooked). Notosetae somewhat more slender than 

 neurosetae, transparent, flattened distally, tapered to rounded tips, 

 with faint spinous rows (fig. 2c). Neuropodia elongated, somewhat 

 flared distaUy, postsetal lobes subtriangular, presetal lobes extending 

 as long digitiform acicular processes. Acicida of both rami yellowish, 

 tapering distally to fine tips within the acicular processes. Neurosetae 

 numerous, forming fan-shaped bundles. Neurosetae (fig. 2d) long, 

 slender, flexible, transparent, ii'idescent, fragile (may be mostly 

 broken), with long bare basal regions and flattened distal spinous 

 regions consisting of transverse rows of low spines; tips very thin, bare, 

 tapered (when broken, fracture in various ways, as indicated by pi. 

 12A, fig. 17 in Mcintosh, 18S5; pi. 3, figs. 1-5 in Ehlers, 1908; pi. 9, 

 figs. 7, 8, in Chamberlin, 1919). 



Anus dorsal, surrounded by small parapodia of last 4 to 5 segments. 

 Anal cirri not noted. Nephridial papillae (figs. lc,26) on ventral bases 

 of parapodia, begin on segment 6 and continue posteriorly, inflated 

 basally, tapered distally to short tubes directed between parapodia. 



i 



