NO. 3575 BATHYAL POLYNOIDS — PETTIBONE H 



Description: Length 26 mm, width of body 3.6 mm; width includ- 

 ing parapodia 13 mm, including setae 22 mm; segments 33, last few 

 segments very sm.all. Body subfusiform, widest in middle, tapering 

 anteriorly and posteriorly. Elytra (usually missing) on large inflated 

 elytrophores, 14 pairs, arranged on segments 2, 4, 5, 7, then on alter- 

 nate segments to 23, 26, 28. First elytron (observed by Moore, 

 now missing) suborbicular, of thick, soft, cushiony texture, thickly 

 covered with soft dome-shaped papillae with single coarse filament 

 at summit. Dorsal tubercles on cu'rigerous segments inflated; cuto- 

 phores of dorsal cirri small; styles missing. 



Prostomium (fig. 5a) bilobed, wider than long, with large pair, 

 opaque ocular areas. Ceratophore of median antenna in middle of 

 prostomium; style missing. Lateral antennae with short cerato- 

 phores formed by anterolateral extensions of prostomium; styles 

 tapered. Palps pau-ed, thick, smooth, tapering. 



First or tentacular segment projecting lateral to prostomimn, 

 achaetous, with 2 pau's tentacular cirri; styles long, slender, tapered. 

 A bulbous facial tubercle between palps, continuous with longitudmal 

 ridge on upper lip. Second or buccal segment with fu-st pair elytro- 

 phores, notopodial acicular lobes, and neuropodial acicular lobes 

 bearing bundles of neurosetae; cuTophores of ventral cutI large, 

 stvles missing. Ventral cirri on remaining segments short, subulate 

 (fig. 5c). 



Parapodia (figs. 5b, c) elongated, subbiramous, with tapering yellow 

 acicula. Notopodia inflated basally, prolonged into long acicular 

 processes, with small tufts of notosetae. Notosetae delicate, finely 

 spinous (fig. 5d). Neuropodia with subcorneal postsetal lobes; 

 presetal lobes prolonged into dehcate acicular processes, vnth long, 

 dense, brushlike bundles of neurosetae. Neurosetae transparent, dis- 

 taUy expanded and flattened, ^vith faint spinous rows, abruptly 

 tapering to entire tips (may be split, appearing bifid, fig. Be). 



Anus dorsal, surrounded by small posterior segments. Anal cirri 

 not observed. Nephridial papillae begin on segment 6 and continue 

 posteriorly, becoming remarkably elongated, some extending beyond 

 distal tips of neuropodia (figs. 5b, c). Pharynx not extended. 



Remarks: Moore (1910) questionably placed this species in the 

 genus Polynoe. Hartman (1938) referred it to Admetella; however, 

 there is no trace of the triangular antennal scales characteristic of 

 Admetella. Other differences are indicated in the key on page 13. 

 As the specific name indicates, B. renotubulata is remarkable for the 

 length of the nephridial papillae. 



Distribution: Off southern California. In 2196 to 2228 fms. 



The 3 bathyal genera, Admetella, Bathy admetella, and Bathymoorea, 

 have a number of characters in common, e.g., prostomia with paired 



