POLYCHAETE WORMS, PART 1 



185 



Description. — Length up to 20 mm., width up to 1.5 iiini., seg- 

 ments up to 70. Body elongated, shghtly flattened, subrectangular 

 in cross section. Prostomium (fig. 46,a,6) subconical, slightly flattened, 

 without eyes, with 4 vciy small subequal anterior antennae (the 

 antennae may be rather indistinct and easily overlooked). Buccal 

 segment without appendages, ventrally forming lateral lips to the 

 funnel-shaped mouth. Fh^st setiger unu'amous, with bilobed presetal 

 lip and single conical postsetal lip, with single bundle of compound 

 setae; dorsal cirri rudimentary; ventral cirri cylindrical; ventrally 

 forms lower lip of mouth. 



Parapodia bu-amous, supported by acicula, with rami well separated, 

 similiar along length of body, becoming thinner and more elongate pos- 

 teriorly, with long cilia along the interramal parapodial border, forming 



Figure 46. — Paralacydoniidae, Paralacydonia paradoxa: a, dorsal view anterior end; 

 b, same, ventral view; c, left middle parapodium, posterior view; d, notoseta; e, spinigerous 

 heterogomph compound neuroseta;/, distal tip of stem of same, with blade broken off. 



