66 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 10 



in numerous teeth, but differs clearly in having, not bidentate, but tri- 

 dentate hooded hooks. Furthermore, the papillation of the occipital ten- 

 tacles is different. 



Holotype. — AHF no. 38. 



Type locality. — Off Turtle Bay, Lower California, in 26-31 fms 

 (coll. 1030-40). 



Distribution. — Lower California, Mexico, south to Panama, Pacific 

 side ; in depths of 5 to 56 fms. 



Genus ONUPHIS Audouin and Edwards 

 Type O. eremita Audouin and Edwards 



Onuphis differs from other genera of Onuphidae in having the fol- 

 lowing combination of characters. The second, apodous ring bears dor- 

 sally a pair of slender cirri; some anterior segments are provided with 

 falcate, toothed, hooded hooks that are usually bidentate, rarely simple. 

 Branchiae are present on some segments, consisting of 2 or more fila- 

 ments in palmate or pectinate arrangement ; subacicular hooks are always 

 yellow, bidentate, present from an anterior region usually between the 

 tenth to fortieth, and continued to the end ; acicula number usually 2 to 

 5 in a parapodium, are typically pale, geniculate and taper to fine pro- 

 jecting points ; anterior hooded hooks may have one, 2, or 3 teeth ( rarely 

 a fourth) ; occasionally (in O. nebulosa, below) a transitional tridentate, 

 simple hook replaces some of the composite spinigers; the latter, when 

 present, occupy a median or inferior position in some anterior segments. 



Onuphis is clearly separable from the nearly related Nothria (below) 

 only in that the former has some branchiae that are branched, whereas in 

 Nothria the branchiae are simple filaments, where present. Although this 

 difference may have no phylogenetic significance, it is herein recognized 

 for convenience. 



The majority of species of Onuphis originate in the Western Hemi- 

 sphere, but the affinities of many are not at all clear and their identity 

 far from certain. In some descriptions only general characters have been 

 cited. A revision based on types is greatly needed. The following de- 

 scribed species are believed to be referable to Onuphis (as distinct from 

 Nothria, p. 83). Seven species are represented in the collections of the 

 Allan Hancock Foundation and are discussed below. 



1. O. africana Augener (1918, p. 335) from West Africa. 



2. O. armandi (Mcintosh) (1885, p. 330) from the Antarctic, in 

 1,950 fms. 



