POLYCHAETE WORMS, PART 1 



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tentacular cirri or represented by a rudimentary knob lateral to the 

 notopodium. 



Parapodia (fig. 5ld) with acicular lobes distinctly bilobed (anterior 

 region) to rounded or slightly incised. Rounded anterior lamellae 

 slightly shorter than the acicular lobes. Posterior lamellae much 

 longer than the acicular lobes, elongate oval, the borders of which 

 may be undulate or somewhat frayed. Preacicular setae shorter, 

 barred, tapering to fine tips. Postacicular setae longer, slender, of 

 2 kinds: (1) Smooth, capillary; (2) curved, finely spinous, more 

 coarsely serrated along basal portion where there may be 5-7 rather 

 large hooks. Setae long, flowing, light colored. 



Branchiae cirriform, sickle-shaped, beginning on setigers 4-8, con- 

 tinuing to near posterior end. Dorsal or branchial cirrus with en- 



FiGURE 49. — Nephtyidae, a-b, Nephtys incisa: a, dorsal view anterior end; b, same, with 

 proboscis extended, c, Nephtys pkta, dorsal view anterior end. d, Nephtys bucera, dorsal 

 view anterior end. 



