POLYCHAETE WORMS, PART 1 313 



1956, fig. 52). First 2 setigers with parapodia closely allied and 

 directed anteriorly. First setiger with notopodial and neiiropodial 

 postsetal lobes conical, directed anteriorl3^ Neiirosetae form a 

 spreading bundle of short to long setae, slender, capillary, directed 

 anteriorly. Notosetae capillary, shorter, fewer and finer than neuro- 

 setae. Second setiger (figs. S2,a-c; 83a) with parapodia ventral to 

 those of the first segment, not completely visible when viewed dorsally. 

 Notopodial and neuropodial postsetal lobes projecting anteriorly, 

 similar to those of first segment but shorter. Notosetae lacking. 

 Neuropodia directed anteriorly, with comblike row of 5-6 shorter, 

 stout, light to dark yellow acicular neurosetae ending in blunt tips, 

 alternating with longer, slightly more slender neurosetae tapering to 

 fine tips (the acicular neurosetae are evidently replaced, as 2-6 

 acicular neurosetae in various stages of formation are buried in the 

 parapodial lobe; the neurosetae of the second setiger must be formed 

 rather late as they were not found in the recently metamorphosed young 

 specimen, according to Hannerz). 



Setiger 3 (fig. 836) with parapodia projecting laterally. Notopodia 

 with fan-shaped bundle of slender capillary notosetae, with broad 

 digitate postsetal lobe, the upper lobule usually larger and may be 

 somewhat set apart from the others. Neuropodia with a comblike 

 vertical series of 4-6 heavy dark slightly curved acicular spines 

 alternating with very slender, shorter capillary neurosetae (evidently 

 the acicular spines are replaced as there may be 2-6 additional acicular 

 spines in process of formation buried in the lobe). Neuropodial 

 postsetal lamella broad, serrated. Setiger 4 (fig. 83c) with a spreading 

 bundle of slender capillary notosetae and a greatly expanded serrated 

 notopodial postsetal lobe, which may appear nearly continuous with 

 the smaller serrated neuropodial postsetal lobe. Neurosetae slender, 

 slightly limbate, with fine tips, shorter and slightly stouter than 

 notosetae. 



Beginning on setiger 5 (fig. 83d), notopodia with spreading bundles 

 of capillary notosetae, with serrated postsetal lobes (fewer serrations 

 than on setiger 4). Neuropodia Avith cylindrical setal lobes, with 

 serrated postsetal lobes. Cylindrical bundles of neurosetae of two 

 kinds: (1) 6-15 shorter, stouter, lanceolate acicular neurosetae toward 

 the center of bundle, tapering to blunt tips, with a hairy sheath which 

 may be variously frayed or w^orn, the so-called penicillate acicular 

 neurosetae (fig. 83,/,.r/); (2) numerous, longer, curved neurosetae with 

 hairy limbate borders, tapering to fine tips (fig. 83e). In addition to 

 the exposed neurosetae, there may be numerous acicular neurosetae 

 buried in the lobe in various stages of development, each with a 

 pubescent sheath. Evidently the acicular neurosetae are replaced 



