244 U.S. NATIONAL MUSEUM BULLETIN 2 27 



Key to the New England Genera of Onuphidae 



1. First or apodous buccal or tentacular segment with a pair of tentacular cirri 



(fig. 64o) 2 



First segment without tentacular cirri (fig. Q5d) . . . Hyalinoecia (p. 254) 



2. Branchiae lacking (subgenus Paradiopatra), simple, cirriform (subgenus 



NoTHRiA, fig. 64(i), pectinate or pinnately divided (subgenus Onuphis, 



fig. 656), not spiraled Onuphis (p. 244) 



Branchiae strongly spiraled, (fig. 66,a,b) Diopatra (p. 250) 



Genus Onuphis Audouin and Milne-Edwards, 1833a 



Type (monotypy) : Onuphis eremita Audouin and Milne-Edwards, 

 1833a. 



Subgenus Nothria Malmgren, 1867 



Type (monotypy): Nothria conchylega (Sars, 1835). 



All 4 species represented have the body long, of nearly uniform 

 width, tapered slightly anteriorly and more or less abruptly posteriorly, 

 cylindrical in anterior 5 or so segments, greatly flattened dorsoventrally 

 along rest of body. Prostomium (fig. 64, a, 6) suboval, with a pair of 

 short ovate or subconical frontal antennae, with 5 occipital antennae 

 with more or less ringed ceratophores and tapering styles. The 3 

 dorsal occipital antennae longer than the 2 latero ventral ones. Ven- 

 trally a pair of prominent globular transverse-oval palps present, 

 Apodous buccal or tentacular segment with a pair of cirriform or subu- 

 late tentacular cirri and ventrally forming an arched lower lip behind 

 the mouth. Dorsal cirri subulate, cirriform on anterior segments, 

 becoming shorter more posteriorly. Ventral cirri subulate, tapering 

 on first 2 to 6 setigers, becoming thick, globular, cushionlike more 

 posteriorly. 



Parapodia with prominent cirriform or subulate postsetal lobes on 

 anterior 6 or so setigers (figs. 64c, 65a), becoming gradually smaller 

 and forming short conical or stublike lobes after about setiger 15. 

 Anterior few parapodia somewhat enlarged and turned forward and 

 provided with special setae, hooded (unless worn), slightly hooked, 

 usually pseudoarticulate. Rest of parapodia provided with (1) shghtly 

 limbate setae, (2) pectinate or comb setae, and (3) beginning on 

 about setigers 9-17, 2 large stout, hooked subacicular setae which are 

 bidentate, hooded (may be worn off). 



Proboscis with mandibles in form of a pau' of long slender wings, 

 flaring anteriorly, whitish in part, more or less translucent, only a 

 small part brownish (fig. 64e). Maxillary jaws delicate, soft, light 

 colored for the most part, with darker lines and darker teeth (fig. 64/) . 

 Maxillary carriers short, subrectangular or tapered posteriorly; 

 maxillae i, falcate hooks; maxillae ii with 6-8 (left) and 8-9 (right) 

 teeth; left maxilla iii with 8-10 teeth, right maxilla iii missing; 



