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Biology. — Found at low water, under rocks, in rocky tide pools, on 

 wharf pilings among mussels, ascidians, sponges. Dredged on 

 bottoms of sand, gravel, with bryozoan nodules, ascidians, as sandy 

 Amaroecium pellucidum. In the Woods Hole region, sexual forms 

 massed with sex products and with swimming setae in the process of 

 forming have been found in July (July 15 and 17, 1953); sexual forms 

 massed with sex products and with swimming setae have been found 

 swimming in surface waters, mainly in the evening, during July, 



Figure 35. — Syllidae, a, Sphaerosyllis erinaceus, dorsal view anterior end. b, Brania 

 clavata, dorsal view anterior end. c, Odontosyllis fulgurans, dorsal view anterior end. 

 d, Exogone dispar, dorsal view anterior end. e-f, Parapionosyllis longicirrata: e, dorsal 

 view anterior end; /, dorsal view posterior end. g, Sphaerosyllis hyslrix, dorsal view 

 parapodium. h, Brania welljleetensis, compound seta. 



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