NO. 3 HARTMAN : ORBINIIDAE, APISTOBRANCHIDAE, PARAONIDAE 275 



The affinities of H. elongatus are clearly with H. kerguelensis (Mc- 

 intosh). Both have branchiae limited largely to abdominal segments; 

 both have rather simple thoracic notopodial and neuropodial lobes; inter- 

 ramal cirri are absent. In H. elongatus the thoracic neuropodial post- 

 setal ridge is low and has a papillar lobe at its midlength; in H. ker- 

 guelensis the corresponding process is a triangular lobe. In H. elongatus 

 abdominal neuropodia have a foliaceous flange extending considerably 

 below the neuropodial postsetal lobe and more or less dark ; such a 

 flange is absent from H. kerguelensis. In H. elongatus the branchiae 

 are more conspicuously developed and Ungulate, with fimbriae along the 

 lateral margins; in H. kerguelensis the branchiae are far less developed 

 and depressed cylindrically ; the fimbriae are obscure. 



Distribution. — H. elongatus is common in littoral sandy mud flats 

 of the northeast Pacific Ocean from Alaska south to California. In its 

 more southern range it is subintertidal and has been taken in soft 

 bottoms in San Pedro area, California, to 293 fathoms but is most 

 abundant in 7 to 136 fathoms (Hartman, 1955). At its upper levels, 

 its range overlaps that of Scoloplos (Scoloplos) actneceps (see below), 

 with which it is apt to be confused. 



Haploscoloplos kerguelensis (Mcintosh) 1885 

 Plate 27, figs. 1-3 



Scoloplos kerguelensis Mcintosh, 1885, pp. 355-356, pi. 43, figs. 6-8, 



pi. 22a, fig. 19; Gravier, 1911, pp. 108-110, pi. 5, figs. 60-63; 



Fauvel, 1916, pp. 443-445, pi. 8, figs. 23-25; Fauvel, 1932a, pp. 



165-167. 

 Haploscoloplos kerguelensis Monro, 1936, p. 160; Okuda, 1937, p. 103, 



figs. 5-6; Okuda, 1938, p. 98; Monro, 1938, p. 623; Monro, 



1939b, p. 124; Hartman, 1953, p. 37. 

 Collection. — South Georgia, Antarctic regions (2). 

 This species comes originally from Kerguelen Islands, subantarctic 

 waters. Monro (1936 to 1939) re-examined the type collection and 

 emended the first account. He showed that the prostomium is distally 

 pointed and not rounded ; the thoracic dorsum is inflated and not de- 

 pressed ; thoracic setigerous segments number from 9 to 11; branchiae 

 are first present from segments 11 to 16 and are thus absent from the 

 thorax. There are no interramal cirri, no ventral cirri and no subpodial 

 lobes. Podial postsetal lobes are limited to single, short, triangular 

 processes in both rami of the thorax. Immature individuals have fur- 

 cate setae in some notopodia but their presence has not been observed 

 in mature specimens. 



