40 THE ANNELIDA POLYCHAETA. 



Synonymy of Genera. 



Nychia Malmgren being preoccupied is replaced by Gattyana Mcintosh. 

 Evarne Malmgren is also preoccupied (Adams, Moll., 1858) and is here replaced 

 by Evarnella, nom. nov. Bylgia Theel is preoccupied (Miinst., Crust.) and is 

 replaced by Bylgides, nom. nov. Langerhansia Mcintosh is preoccupied by 

 Langerhansia Czerniawsky, a syUid genus. Eupolynoe seems first to have been 

 used by Mcintosh without diagnosis or discussion. He at that time placed 

 under it (Ann. mag. nat. hist., 1874, ser. 4, 13, p. 264) two new species, occiden- 

 talis and anticostiensis. The first seems to conform to Eucranta Malmgren 

 and is quite likely E. villosa Malmgren, type of the genus; anticostiensis is appar- 

 ently a Harmothoe. Accordingly Eupolynoe is suppressed. Hololepidella 

 Willey (Ceylon pearl oyster fisheries report 1905, pt. 4, p. 251) seems identical 

 with Lepidametria Webster. Adyte St. Joseph is regarded as a synonym of 

 Scalisetosus Mcintosh. Parapolynoe Czerniawsky does not seem sufficiently 

 different from Polynoe to make separation justifiable. Norepea Johnston (1865) 

 falls as a synonym to IpMone Kinberg. It was established with Polynoe peronea 

 Schmarda as the type, but that species is the same as Iphione muricata (Savigny). 



Plotolepis, gen. nov.^ 



Body short and slender, with the somites comparatively few. 



Eyes four, small, sessile, the anterior pair more widely separated and those 

 on each side close together. Prostomium bearing anteriorly a median and 

 two lateral tentacles. 



Parapodia lacking notopodial lobe and notopodial setae. Neuropodia 

 elongate, with setae numerous. Setae in two groups, a smaller ventral one 

 of coarser hairs and a dorsal one of much more numerous finer hairs. Heads 

 of setae scaled, tips entire. Notocirri of two types, most of them being conspicu- 

 ously elongate, all in the anterior region and in the posterior region those of 

 alternate pairs, the intermediate ones of normal character. In the type the 

 elongate cirri are gi-eatly inflated and apparently act as floats. 



The elytra are borne on somites II, IV, V, VII, IX, XI, XIII, XV, XVII, 

 XIX, and XXI. They are very small, with elytrophores large; not at all extend- 

 ing over dorsum, each reaching but httle beyond its elytrophore. All but the 

 most posterior ones inflated, vesicular. 



' 7rXco7ds, floating, and Xe?ris, scale. 



