POIANOIDAE. . 39 



g. Elytra fifteen pairs, all in the anterior region; notopodial setae comiiionly finer than 

 the neuropodials. 



h. Prostomium rounded anteriorly, without peaks Enipo Malmgren. 



hh. Prostomium with anterior peaks. 



i. Neuropodial setae distally bifid; notopodials with transverse rows of spines or 



pectinae Polynoe Savigny . 



a. Neuropodial setae distally entire ; notopodials simply serrate . Nemidia Malmgren. 

 gg. Elytra not thus confined to the anterior region; notopodials not finer than the neuro- 

 podial setae Polyeunoa Mcintosh. 



;. Body short and more or less depressed, more rarely sublinear. 

 d. Dorsum normally completely covered with the elytra. 

 e. Median antenna inserted at the margin. 



/. Parapodia uniramous Polynoella Mcintosh. 



//. Parapodia biramous. 



g. Notocirri alternately short and long; dorsal setae stouter than the ventrals. 



Kermadecella Darboux. 

 gg. Notocirri all of the same length. 



h. Notopodial setae of same thickness as the neuropodials Intoshella Darboux. 



hh. Notopodials not of same thickness as the neuropodial setae. 



i. Notopodials stouter than the neuropodials, or at least equal to them. 



j. Notopodials smooth Meloenis Mcintosh. 



jj. Notopodials with transverse rows of spines. 



k. Body linear or sublinear; tips of neuropodial setae wholly straight, bifid, 



with the incision very fine Eucranta Malmgren. 



kk. Body elliptic or ovate oblong; tips of neuropodials obviously more or less 

 curved, when bifid the teeth diverging. 



I. Elytra sixteen pairs Leucia Malmgren. 



II. Elytra fifteen pairs. 



m. Elytra smooth Laenilla Malmgren. 



; mm. Elytra granular or scabrous. 



n. Anterior eyes situated on the peaks, small, ventral or sub ventral; 



peaks close to the median tentacle Harmothoe Kinberg. 



nn. Anterior eyes farther caudad, larger, lateral in position; peaks 

 usually well separated from the median tentacle. 

 0. Neuropodial setae with tips entire. 



p. Tips of neuropodials long and fine Antinoe Kinberg. 



pp. Tips of neuropodials short, not hair-like. 



q. Head very broad; ceratophore of median tentacle extends 

 between peaks caudad of middle of prostomium; anterior 

 eyes much larger than the caudal. . . .Phyllantinoe Mcintosh. 

 qq. Head not unusually broad, and ceratophore of median an- 

 tenna not extending caudad of middle. . . .Eunoe Malmgren. 



00. Neuropodials with tips bifid Evarnelln, nom. nov. 



ii. Notopodials finer than the neuropodial setae, typically in part thread-like 

 distally. 



j. Notopodials smooth Robertianella Mcintosh. 



jj. Notopodials with transverse rows of spines. 



k. Ventral setae with tips entire Gatlyana Mcintosh. 



kk. Ventral setae with tips bifid Paranychia Czerniawsky. 



ee. Median antenna not inserted at the margin. 

 /. Median antenna inserted dorsally. 



Notopodial setae of same thickness as the finer of the ventrals, these being of two 



kinds HerdmancUa Darboux. 



ff. Median antenna inserted ventrally. Notopodial setae of two kinds, all finer than 



the neuropodials Gastroceraiella Darboux. 



dd. Dorsum normally left in part uncovered by the elytra. 



Median antenna inserted at the margin; notopodial setae coarser than the ventrals. 



e. Notopodial setae with transverse series of spinules Lagisca Malmgren. 



ee. Notopodial setae simply serrate or wholly smooth. 



/. Notopodials smooth; tip of ventrals simple Hermadion Kinberg. 



ff. Notopodials serrate; tip of ventrals bifid Scalisetosus Mcintosh. 



