pairs of nephridia not three large and the rest usual in the genus Pdh/cirriis and until more 

 small. Verrill (187;^a) describes P. c.riDiiiis as specimens have been studied in detail it is 

 having 25 segments with notosetae and uncini better to treat these larger specimens with 

 from setiger 8 and this desci-iption is repeated 25-31 bundles of notosetae as a separate sub- 

 by Miner (1950). It is possible that P. exi))iiiix species. 



is a very variable species with 16-31 segments Records. — On coral at 18 m off Beaufort 



bearing notosetae. uncini commencing on seti- (20, *). 



ger 7-9 and three to six pairs of large nephridia. Distribii fiaii . — Probably New England to 



However this range of variation is wider than is North Carolina but records confused. 



FAMILY SABELLIDAE 



Key to genera and species 



1 Thoracic neurosetae as a row of avicular uncini and often a 



row of pickaxe setae as well. Radioles usually with eyespots 2 



1' Thoracic neurosetae as a row of long-shafted hooks. Radioles 



without eyespots 10 



2 A row of pickaxe setae as well as avicular uncini on thorax. 



No stylodes on radioles 3 



2' No pickaxe setae. Radioles with paired stylodes externally 

 {Bfinichioiiinia). [Uncini with two arcs of denticles. Stylodes 

 slender. Dark flecks on body] B. in(j)'()t)iaculuta 



3 Collar setae in compact bundles and consist of long-winged 



capillaries 5 



3' Collar setae in long double rows and consist of stout capil- 

 laries with short blades just projecting from body {Hi/psi- 

 comiis) 4 



4 ("ollar produced ventrally as a sheath to branchial lobes (H. 



ciyciiDispiciens) No N.C. record 



4' Collar uniformly short, not produced ventrally H. })li(t((>tav)iia 



5 Thoracic notosetae include both winged capillaries and paleae 



with very short broad blades. [Dorsal radioles with eye- 

 spots halfway along {Pota nulla)] 6 



5' Thoracic notosetae as winged capillaries with broader or 



narrower wings: no i)aleae 7 



6 Collar prolonged ventrally forming a basal sheath for branchial 



lobes P. spathiferus 



6' Collar not prolonged ventrally P. reniforuiis 



7 Two or more radioles, each with one large subterminal eye 



{Mccjcilom ma) 8 



7' Dorsal radioles with a series of small lateral eyespots (Sabella) 9 



8 Subterminal eyes on most radioles. [Collar not notched dorso- 



laterally 1 M. lobifcrii ni 



8' Subterminal eye restricted to two dorsal radioles M. b'utculatiim 



124 



