16 U.S. NATIONAL JIUSEUM BULLETIN 22 7 



5. At least some of the notosetae with slender capillary tips or notosetae more 



slender than neurosetae 6 



Notosetae stouter than neurosetae, with well marked spinous rows and 

 smooth blunt to pointed tips (fig. 7c) 9 



6. Segments more than 45. Elytra on anterior part of body only, leaving 



posterior part uncovered Enipo (p. 22) 



Segments about 40. Elytra cover dorsum 7 



7. Neurosetae with slender sharp tips, not hooked (fig. 4/). . Hartmania (p. 25) 

 At least some of neurosetae with hooked tips 8 



8. Neurosetae of 2 forms, some with slender sharp tips and some with bifid tips 



(fig. G,j-k) Arcteobia (p. 27) 



Neurosetae with entire tips (fig. 5,c-d) Gattyana (p. 28) 



9. Neurosetae long, slender, at least some end in capillary tips. 



Antinoella (p. 30) 

 Neurosetae stouter, with tips straight or slightly hooked, not capillary. . 10 



10. Neurosetae with hairs on distal tip (fig. 4,c-d). . . . Austrolaenilla (p. 32) 

 Neurosetae without hairs 11 



11. Upper neurosetae with slender forked tips (fig. 46). . . . Eucranta (p. 33) 

 Neurosetae with tips bare, hooked (subgenus Eunoc, fig. 9c), with sub- 

 terminal secondary tooth (subgenus Harmothoe, fig. 7d) or with secondary 

 tooth present, rudimentary or absent (subgenus Lagisca). 



' Harmothoe (p. 34) 



Genus Lepidonotus Leach, 1816; emend. Malmgren, 1865 



Type (designated by Malmgren, 1867, p. 4) : Lepidonotus sguamatus 

 (Linne, 1758). 



Both species represented have the body short, linear, of nearly 

 uniform width, with 26 setigerous segments. Elytra 12 pairs, covering 

 the dorsum; elytral surface studded with chitinous tubercles and 

 lateral fringes of papillae (fig. ?>,a,d,e). Antennae, tentacular and 

 dorsal cirri with subterminal enlargements and dark bands on the 

 enlarged parts. Notosetae spiny, finer and shorter than the nem'o- 

 setae. Neurosetae stout, dark amber colored, with several rows of 

 spines and smooth hooked tips (without secondary tooth). 



Key to the New England Species of Lepidonotus 



1. Elytral tubercles variable in size — larger and smaller, crowded, conical to low 

 mounds (fig. 3d). Posterior pair of elytra notched medially (fig. 3a). Upper 

 row notosetae shorter, ending in blunt tips, rest end in capillary tips. 



L. squamatus 

 Elytral tubercles tiny, widely spaced (fig. 3e) . Posterior pair of elytra nearly 

 straight medially, not notched. All the notosetae end in capillary tips. 



L. sublevis 



Lepidonotus squamatus (Linne, 1758) 



Figure 3,a-d 



Lepidonotus squamatus Verrill, 1881, pp. 288, 290, 291, 293, 294, 296, 300, 303, 306, 

 307, 313, 317, 321, 323, pi. 4, fig. 1, pi. 6, fig. 4.— Webster and'Benedict, 1884, 

 p. 699;^1887, p. 708.— Moore, 1909a, p. 136.— Sumner, Osburn, and Cole, 



