POLYCHAETE WORMS, PART 1 9 



Body with 2 or more rows of large spherical capsules, segraentally arranged. 

 Prostomium and tentacular segment indistinct. Segmentation indistinct 

 except as marked by parapodia. Parapodia uniramous. Body covered 

 with papillae (fig. 52) Sphaerodoridae (p. 205) 



14. With dorsal cirri posterior to lateral fanlike tufts of notosetae 15 



Dorsal cirri lacking or otherwise 16 



15. Notosetae in lateral tufts curving dorsally and forming fan-shaped groups or 



transverse rows. Neurosetae compound. Without branchiae (fig. 12). 



Chrysopetalidae (p. 54) 

 Notosetae extending laterally. Neurosetae simple. With paired branched 

 branchiae posterior to bases of notopodia on certain number of seg- 

 ments (fie. 13) Amphinomidae (p. 55) 



16. Dorsal and ventral cirri, if present, not leaflike or globular 17 



Dorsal and ventral cirri flattened, leaflike or more or less globular. Pro- 

 stomium with 4-5 antennae. Tentacular cirri 2-4 pairs. Parapodia 

 uniramous (exceptionally subbiramous) ; setae compound (figs. 16-21). 



Phyllodocidae (p. 68) 



17. Prostomium conical, annulated, ending distally in 4 minute antennae. Peri- 



stomium fused with prostomium, without tentacular cirri. Large powerful 



proboscis. Burrow in sand or mud . . superfamily Glycerea (p. 209) . 18 



Prostomium otherwise 19 



18. Body with parapodia similar, either all vmiramous or all biramous. Dorsal 



cirri small, globular; ventral cirri larger, conical. Proboscis with 4 sub- 

 equal jaws or macrognaths (figs. 53-55) Glyceridae (p. 209) 



Body divided into 2-3 regions: (1) anterior region with uniramous para- 

 podia; (2) transitional region in which notopodia develop gradually (may 

 be lacking) ; (3) posterior biramous region with rami well separated. 

 Both dorsal and ventral cirri conical to ligulate. Proboscis with pair of 

 dentate macrognaths and variable number of micrognaths (figs. 56-59). 



Goniadidae (p. 218) 



19. Body subrectangular in cross-section. Biramous parapodia with rami well 



separated and with long cilia along interramal border; notosetae and 

 neurosetae arranged in fan-shaped bundles, with more or less developed 

 presetal and postsetal flattened plates or lamellae. Prostomium flattened, 

 shield shaped, subconical to subrectangular, with 4 small antennae. 



Burrow in sand or mud 20 



Body, parapodia, and prostomium otherwise 21 



20. Tentacular or buccal segment with notosetae and neurosetae, with pair of 



small ventral tentacular cirri. Neurosetae simple (figs. 47-51). 



Nephtyidae (p. 186) 

 Tentacular or buccal segment achaetous, without tentacular cirri. Neuro- 

 setae compound (fig. 46) . . . Paralacydoniidae, new family (p. 184) 



21. With 1-2 achaetous and apodous tentacular or buccal segments, without 



tentacular cirri (or with only a single short latcrodorsal pair). With 

 elaborate dark chitinous jaw apparatvis consisting of pair of ventral 

 mandibles and more dorsal maxillae consisting of few to numerous paired 



pieces . . superfamily Eunicea (p. 229) 22 



With 1-8 pairs lateral tentacular cirri. Jaws absent or otherwise ... 26 



22. Prostomium simple conical or suboval, without antennae or distinct palps. 



Parapodia without dorsal or ventral cirri. First 2 segments achaetous 

 and apodous, without tentacular cirri. Body smooth, elongate, cylindri- 

 cal, resembling an earthworm. Burrowing, carnivorous 23 



