326 THE ANNELIDA POLYCHAETA. 



d. With two complete somites apodous. 



Two eyes and five pairs of maxillae Halla A. Costa. 



dd. With one complete somite apodous, a second incomplete somite may be evident ventrally. 



e. With six pairs of maxillae Danymene Kinberg. 



ee. With five pairs of maxillae Oenone Savigny. 



The key follows the general lines indicated in Grube's revision (Jahresb. 

 Schles. gesellsch., 1879, 56, p. 78), but with such differences as further knowledge 

 has rendered necessary. There is considerable uncertainty with reference to 

 some genera that have been proposed, and some here suppressed may be found 

 to have differential generic characters not evident in the published accounts, 

 while others may have to be abolished. 



Synonymy of Genera. 



The genus Enonella, founded by Stimpson (Invertb. Grand Manan, 1853, 

 p. 34, f. 25, 25 a-d) for a species (bicarinata) found at Grand Manan is far too 

 incompletely described to be placed with certainty. It appears to belong in 

 this group. It is readily distinguished from other lumbrinereids by the form 

 of the prostomium with its two laterally directed processes in front. 



Lais Kinberg (1865), being preoccupied in Acaridea, was replaced by Ehlers 

 with Notopsilus (1868). 



As the type-species, fulgida Savigny, of Aglaura Savigny (1820), which, 

 being preoccupied, was later replaced by Aglaurides Ehlers (1868), has now been 

 shown to be the same as lucida Savigny, the type of Oenone, the first name and 

 its substitute lapses. There is ground for thinking that fonensis Kinberg may 

 also be the same as lucida, in which case Danymene will also lapse. It is kept 

 apart at present on the basis of the supposed difference in the number of maxillae. 



Cirrobranchia Ehlers is in synonomy with Halla A. Costa, as is also Plio- 

 ceras of Quatrefages. 



Maclovia Grube is merged with Arabella Grube. 



Zygolobus Grube (written Zygophyllus in the description of plates) is in- 

 cluded in Larymna Kinberg. 



Bidenkap (Kgl. Norsk, vid. selsk. Skr., 1907, 1906, no. 10, p. 16) has 

 established the Uncinisetidae for his genus Unciniseta characterized by having 

 biramous parapodia bearing only crochets and lacking cirri. It is apparently 

 near the Lumbrinereidae and Dorvilleidae ; but, unfortunately, the character 

 of the proboscis in the type and only known species, U. swenanderi Bid., is not 

 indicated. 



