226 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 15 



setae, pointed setae ("Pfriemborsten" or "awl setae" of Eisig), the 

 long, distally pointed spinous setae present in all notopodia and most 

 abdominal neuropodia; sometimes called camerated, areolated, canali- 

 culated and fenestrated because of the ladderlike arrangement of the 

 internal structure of the shaft. 



spears or spines, the thick, acicular spines in posterior thoracic neuro- 

 podia of Phylo ; arranged in an anterior row, the dorsalmost one as- 

 sociated with the large glandular organ; called also defense spines and 

 other descriptive names. 



statocysts, the thoracic paired organs located at the base of branchiae 

 or in a location corresponding to the branchial base; epithelial in origin 

 and present only in species of some genera. 



subpodial lobe, or ventral cirrus, a fleshy lobe located immediately 

 below the neuropodium or some distance below it, sometimes simple, or 

 multiple, but less complex than subpodial or ventral fringe. 



subuluncini, resembling uncini with a long, distally pointed projec- 

 tion, located in thoracic neuropodia, limited to some species in some 

 genera, as Naineris. 



swan-shaped setae or hooks, present in some thoracic neuropodia, 

 known only in Proscoloplos. 



thorax, the anterior part of the body, usually broader and more 

 depressed than the abdomen, with lateral parapodia differing from those 

 in the abdomen. 



uncini, the acicular, distally blunt, straight or somewhat curved to 

 sickle-shaped, smooth or ridged or serrated modified setae present in 

 thoracic neuropodia of some species in some genera, especially Scoloplos. 



ventral cirrus, see subpodial lobe. 



ventral fringe, the serial rows of lobes or papillae on the ventral 

 side of some thoracic and abdominal segments, especially in species of 

 Orbinia, sometimes more or less continuous or like subpodial fringe. 



ventral pads, the glandular areas adjacent to neuropodia of some 

 abdominal segments, especially conspicuous at sexual maturity and dis- 

 tended with gonadial substances. 



Reproduction and Development 



The development of Naineris laevigata from Japan is described by 

 Okuda (1946, pp. 135-139). Adult individuals inhabit muddy bottoms 

 in the Zostera zone. Spawning occurs from the end of May to the 

 middle of June. The eggs are laid on the surface of the mud, not in 



