220 U.S. NATIONAL MUSEUM BULLETIN 227 



2. Proboscis with bilateral series of chevrons near base; surface of proboscis 



covered with numerous similar proboscideal organs; neurosetae both com- 

 pound falcigers and spinigers Goniadella 



Proboscis without chevrons; surface of proboscis with longitudinal series of 

 horny spinous proboscideal organs of remarkable diversity, grossly resem- 

 bling a radula of agast ropod (fig. 56/t) ; neurosetae compound spinigers only 

 (fig. 561) Glycinde 



3. Proboscis with bilateral series of chevrons near base (fig. 58c) Goniada 



Proboscis without chevrons Ophioglycera 



Genus Goniadella Hartman, 1950 



Type (monotypy): Goniadella gracilis (Verrill, 1873a). Contains 

 only one New England species. 



Goniadella gracilis (Verrill, 1873a) 



Figure 5Q,a-g 



Eone gracilis Verrill, 1873a, pp. 598, 596. 



Goniada gracilis Verrill, 1879, p. 174. — Webster and Benedict, 1884, p. 723, 



pi. 5, figs. 49-52.— Hartman, 1944a, p. 339, pi. 15, fig. 2, pi. 18, fig, 3. 

 Goniadella gracilis Hartman, 1950, p. 42, pi. 5, figs. 4-8. 



Description. — Length up to 50 mm., width up to 1 mm., segments 

 up to 100 or more. Prostomium (fig. 56a) distinctly annulated, 

 including wide basal ring (fused prostomium and peristomium) and 

 7-8 more distal rings. With a pair of eyespots in the basal ring and 

 often a subdistal pair (in third ring from the end). With 4 slender, 

 ringed antennae. First pair parapodia rudimentary. 



Anterior region (fig. 566) with about 30 segments (27-32), with 

 dorsal and ventral cirri elongate, triangular, with postsetal lobe 

 blunt and entire, of about same length as cirri, with presetal lobe 

 simple, conspicuously longer, often tending to stand erect. Neuro- 

 setae delicate, colorless, compound spinigers and falcigers (fig. 56d). 

 Posterior region (fig. 56c) with an additional small inconspicuous 

 notopodial lobe at the base of the dorsal cirri, with a few (2-4) simple 

 acicular notosetae sometimes extending out about as far as the 

 dorsal cirri. 



Proboscis covered mth minute papillae or proboscideal organs of a 

 single kind; in addition, with bilateral series of chevrons on the basal 

 part of the proboscis (fig. 56e), about 26 in each series, closely spaced. 

 Paired dentate macrognaths present having 3-4 teeth (fig. 56/); 

 micrognaths H-shaped (fig. 56^), about 10 in the dorsal arc and 3 

 larger ones in the ventral arc. Color: iridescent pale red or yellowish 

 white. 



Biology. — Found burrowing in fine sand at low water. Dredged 

 on bottoms of fine gravel, fine to coarse sand, and soft mud. Because 



