setae. Few setae per parapodium; four to six 

 short capillaries per ramus up to setiger 7 and 

 one or two fine capillaries plus one or two short 

 acicuiar hooks per ramus in subsequent seg- 

 ments. Individual hooks minutely bidentate and 

 without a hood or sheath. 



Rccinxls. — One specimen from 10 m off Beau- 

 fort (*). This is a new record for the United 

 States. 



Dixtrihtdioii. — Ireland; in 10-20 m. 



Chaetozone gayheadia Hartman, 19(Jo 



Cliiu'tdzcme gayheadia Hartman, 1965a: 166. 

 Chaetozone ^efom. - Day, 1967: 510, Fig. 20.1. 

 1-p (noil Malmgren). 



/?rforr/.s-.— Off Beaufort in 40-160 m {*). 

 Dixtrihntion. — New England to North Caro- 

 lina in 40-:500 m: South Africa (95 m). 



Chaetozone selosa Malmgren, 1867 



Cliaetozone setosa. - p'auvel, 1927: 101, Fig. 

 35 d-k. - Hartman 1965a: 166; 1969: 241. 

 Fig. 1-3. 



R( eordx. — Common off Beaufort in 40-200 m 

 (21,*). 



Distfihntioii. — Arctic and in temperate waters 

 of the North and South Atlantic; southern 

 California: Mediterranean; probably cosmopoli- 

 tan; from 40 to 4,436 m. 



FAMILY ORBINIIDAE 



Notes on the Genera of the 

 Subfamily Orbiniinae 



While the definitions of genera of the sub- 

 family Orbiniinae published by different workers 

 readily distinguish typical species, they are not 

 in absolute agreement and "difficult" species 

 may be referred to different genera or sub- 

 genera according to which authority is con- 

 sulted. The orbiniids recorded from North Caro- 

 lina include several of these difficult species, 

 and it was thus necessary to consitler the ge- 

 neric definitions very carefully before the col- 

 lection could be identified. As the work pro- 

 ceeded it appf^ared worthwhile to redefine all 

 genera of the subfamily Orbiniinae. 



Useful discussions of the whole family Orbi- 

 niidae will be found in Eisig (1914), P'auvel 

 (1927), Hartman (1957), Pettibone (1957), and 

 Day (1967). Hartman (1957: 242) divided the 

 family Orbiniidae into two subfamilies. The 

 Protoariciinae includes genera with two achae- 

 tous segments behind the prostomium. We are 

 not concerned with this subfamily here and for 

 further details the reader is referred to Hart- 

 man's account. The subfamily Orbiniinae in- 

 cludes all the larger orbiniids with one achae- 

 tous (peristomial) segment behind the pro- 

 stomium, an eversible epithelial proboscis, 

 well-developed parapodia and branchiae on 

 many .segments. The Orbiniinae include the 

 genera Orh'niia Quatrefages, Phi/lo Kinberg, 



Seolopliis (Seoloplos) Blainville, Seoloplos (Leo- 

 da mas) Kinberg, Seolarieia Eisig. Haplot^eolo- 

 plos Monro, Califia Hartman, and Naiiieris 

 Blainville (with the subgenus PohjiiaineriH 

 Pettibone). 



These genera are distinguished by different 

 combinations of characters. Generic definitions 

 will be given later, but meanwhile it may be 

 noted that Nainefi-^ is easily separated by the 

 possession of a bluntly rounded to square pro- 

 stomium; all other genera have pointed conical 

 prostomia. 



Seoloplos occupies a central position in the 

 subfamily. It agrees with Haplnseoloplox and 

 Califia in having none to two foot-papillae ( = 

 postsetal papillae, podial lobes or podial fringe) 

 on the posterior thoracic neuropodia and none 

 to two stomach-papillae ( = subpodial papillae, 

 ventral papillae or ventral fringe) below the 

 neuropodia. In distinction to this, typical species 

 of Orhiiiia and Pl/ijlo have five or more foot- 

 papillae and numerous stomach-papillae. In- 

 evitably, "difficult" species occur; Oi'binia jolni- 

 siiiii (Moore) has only 1 foot-papilla but a maxi- 

 mum of 3 stomach-papillae; Ofbiuia dabia Day 

 has a maximum of 3 foot-papillae and up to 

 12 stomach-papillae; Phylo iiorvegieas (Sars) 

 and Orbinia exarmata (Fauvel), have more than 

 10 foot -papillae but no stomach-papillae; Seolo- 

 plos (Seoloplos) riseri Pettibone has a maxi- 

 mum of 3 foot-papillae and up to 9 stomach- 

 papillae. It may be noted too, that it is sometimes 



83 



