206 



U.S. NATIONAL MUSEUM BULLETIN 227 



Key to the New England Genera of Sphaerodoridae 



1. Setae simple, hooked (fig. 52c) 

 Setae compound (fig. 52/) . . 



Sphaerodorum 

 . . Ephesiella 



Genus Sphaerodorum Oersted, 1843; char, emend. 



Ephesia Rathke, 1843, preoccupied by Heubuer (1818, Lepidoptera) ; type (mono- 



typy) : Ephesia gracilis Rathke, 1843. 

 Pollicita Johnston, 1845; type (monotypy) : PolUcita peripatus Johnston, 1845; 



=^ Sphaerodorum gracilis (Rathke, 1843). 



Type (monotypy): Sphaerodorum flavum Oersted, 184:3 ;= Sphae- 

 rodorum gracilis (Rathke, 1843). 



The genus is herein revised in comphance with the rules of nomen- 

 clature. Ephesia Rathke, 1843, with t3q:>e E. gracilis, although pre- 

 occupied by Heubner in Lepidoptera, has continued to be used. 

 Sphaerodorum Oersted, 1843, with type S. flavum and a synonym of 

 E. gracilis, has been used in a different sense following Levinsen, 1883. 



pop 



_-ca 



^^^>^ 



•pap 



b <i- 



c o o "^ 



O GO ^ 

 'GO ^ 



;PO Oo<^00 



c?o^ooo^' 



Figure 52. — Sphaerodoridae, a-c, Sphaerodorum gracilis: a, dorsal view anterior end; 

 b, parapodium; c, seta, d-f, Ephesiella minuta: d, dorsal view anterior end; e, same, 

 posterior end; /, seta. 



