46 U.S. NATIONAL MUSEUM BULLETIN 227 



Key to the New England Genera of Sigalionidae 



1. Without cirriform branchiae. Prostomium and tentacular segment with a 



single median antenna, 2 pairs similar tentacular cirri, a pair of rather 



short subulate palps, without setae (fig. 10/) Pholoe (p. 46) 



With cirriform branchiae on all segments except some anterior ones (fig. 10c). 

 Prostomium with 1-3 antennae, a pair of long palps; tentacular segment 

 with 2 pairs tentacular cirri, with numerous fine simple setae (fig. llo) . . 2 



2. Prostomium without a median antenna, with 2 small lateral antennae inserted 



anteriorly on prostomium (fig. 11a). Elytra with fringe of pinnately- 



branched papillae on external border (fig. 116) Sigalion (p. 48) 



Prostomium with a median antenna (fig. 106); lateral antennae free only at 

 tips, fused proximally to inner dorsal part of parapodial lobes of first or 

 tentacular segment. Elytra with external border smooth or with simple 

 fringe of papillae 3 



3. Neurosetae of several kinds, some of which are compound, with terminal 



blades with bifid hooked tips (compound falcigers, fig. lOd). 



Sthenelais (p. 49) 

 Most of neurosetae compound, with terminal blades with tips tapering, pointed 

 (compound spinigers, fig. lOe) ; without compound falcigers. 



Leanira (p. 51) 



Genus Pholoe Johnston, 1839 



Type (monotypy) : Pholoe inornata Johnston, 1839; =Pholoe minuta 

 Fabricius, 1780). Contains only one New England species. 



Pholoe minuta (Fabricius, 1780) 



Figure 10,/-^^ 



Pholoe minuta Verrill, 1881, pp. 290, 295, 303, 307, 311, 314, pi. 7, fig. 4.— Webster 

 and Benedict, 1884, p. 701; 1887, p. 709.— Whiteaves, 1901, p. 83.— Fauvel, 

 1923, p. 120, fig. 44,a-;i.— Procter, 1933, p. 136.— Treadwell, 1948, p. 12, 

 fig. 3a.— Miner, 1950, p. 311, pi. 101.— Pratt, 1951, p. 328.— Pettibone, 1953, 

 p. 77, pi. 39; 1954, p. 230, fig. 26/; 1956a, p. 552.— Newell, 1954, p. 333.— 

 Uschakov, 1955, p. 165, fig. 44.— Southward, 1956, p. 258.— Stickney, 1959, 

 p. 15.— Clark, 1960, p. 15.— Day, 1960, p. 288.— Berkeley and Berkeley, 

 1961, p. 656.— Wesenberg-Lund, 1962, p. 34.— EHason, 1962, p. 229. 



Description.' — Length up to 25 mm., width including setae up to 

 4 mm., segments 36-84. Body small, elongate, nearly hnear, flat- 

 tened dorsoventrally, fragmenting easily. Ventral surface and para- 

 podial lobes with short papillae, usually covered with debris. Elytra 

 numerous pairs, on all segments from segment 23 on, covering the 

 dorsum except for a narrow middorsal part; elytral surface smooth, 

 with few somewhat moniliform papillae on posterior border. Prosto- 

 mium small, suboval, with 2 pairs large eyes, each pair closely ap- 

 proximated on each side, with single short subulate median antenna. 

 Tentacular parapodial lobes with 2 pairs tentacular cirri similar to 

 median antenna, without setae. A digitiform facial tubercle on a 

 rounded lobe dorsal to mouth and ventral to prostomium (may be 

 somewhat withdrawn) . Notosetae simple, slender, curved to strongly 



