REVISION OF PILARGIDAE — PETTIBONE 



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Description: Length to 300 mm., width to 4 mm., segments to 500. 

 Body flattened, ribbon-like, tapered anteriorly and posteriorly. 

 Integument with low papillae on body and appendages, more nu- 

 merous dorsally. Prostomium small, inconspicuous, with ovate 

 palpophores indistinct from prostomium and minute palpostyles, 

 with paired short lateral antennae. Tentacular segment fused with 

 prostomium, with two pairs of short tentacular cirri, dorsal pair 

 slightly longer than ventral pair. Dorsal cirri of first setigerous 



b 



Figure 2. — Pilargis berkeleyae Monro (from paratype of P. viaculata Hartman, AHF 1716): 

 a, parapodium from middle of body of inflated specimen, with pigmented glandular areas 

 shown; h, neurosetae from same. 



segment longer than following. Inflated dorsal cirrophores of noto- 

 podia variable in shape, as indicated in figures drawn from different 

 parts of body and individuals in different states of contraction; 

 notoacicida colorless, without notosetae; dorsal cirri conical to ovate. 

 Neuropodia conical, with stout nem"oacicula and bundle of simple 

 neurosetae; neurosetae variable in length; shorter neurosetae serrate, 

 with tips slightly hooked, sometimes faintly bifid; longest neurosetae 

 tapering to fine slightly hooked tips, smooth or very fainth^ serrated; 

 ventral cirri on all setigerous segments. Pygidium rounded, with 0, 

 2 or 3 anal cirri. Proboscis thin-walled translucent sac. Reddish 

 to dark-brown glandular areas in notopodial cirrophores and ventral 

 bases of neuropodia. 



