52 



U.S. NATIONAL MUSEUM BULLETIN 2 27 



b 



Drc- 



, 'Sty 



lAn 



mAn 



Figure 11. — Sigalionidae, a-h, Sigalion arenicola: a, dorsal view prostomium and tentacular 

 segment; h, elytron, c-e, Sthenelais limicola: c, left anterior elytron; d, left middle elytron; 

 e, anterior parapodium, posterior view. /, Leanira hystricis, prostomium and tentacular 

 segment (only bases of palps shown). 



stems smooth or somewhat spiny, mth terminal blades subulate, 

 transversely canaliculated, tapering to delicate attenuated tips fcom- 

 pound spinigers, fig. lOe); may be few additional simple, spinous, 

 pointed neurosetae (easily overlooked). 



Key to the New England Species of Leanira 



1. With pair of long dorsal cirri on segment 3 (extending to about tips of setae). 

 Elytra with fringe of delicate papillae on lateral borders. Median antenna 

 with pair of auricular ctenidia on ceratophore ; style long and slender. 



L. tetragona 



