116 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL.22 



The first segment is uniramous, provided with a pair of small neuro- 

 podial fascicles. The first 17 segments have slender, distally pointed setae 

 only. Thereafter, hooded hooks are present in neuropodia, at first only 

 one or two in a series, accompanied by pointed setae. By segment 31 there 

 are 5 or 6 hooks alternating with as many long setae. The hooks have an 

 unusually small terminal hooked end, covered by a long, hyaline, distally 

 rounded hood. 



These individuals differ from typical P. cirrifera Wiren (see Fauvel, 

 1927, p. 62, fig. 21) in their small size and reduction of prostomial eyes. 

 The species is more widely known from arctic and boreal seas, and has 

 been recovered from shallower seabottoms of southern California (un- 

 published records). 



Prionospio spp. 



A small specimen from Tanner Basin (Sta. 6346) with 56 anterior 

 segments, measures 24 mm long. The peristomium lacks lateral wings. 

 The prostomium has two minute eyes near its mid-length ; it is widest 

 at its anterior margin and forms a narrow caruncle extending back to 

 segment 3. Branchiae number 3 pairs; the first are smaller and slenderer 

 than the others and clearly bipinnate; the second and third pairs are 

 much larger, broader and heavily fimbriated along their lateral margins, 

 but not bipinnate. 



Notopodial postsetal lobes of the first 5 segments are distally pro- 

 longed as thin, tapering lobes, with those of the second and third pairs 

 the largest and longest. On the next few segments the postsetal lobe is 

 still large and triangular, but it diminishes abruptly within a few more 

 segments. Neuropodial hooks are first present at segment 18, at first one 

 or two in a fascicle; they increase in number gradually to 10-12, alternat- 

 ing with pointed setae, accompanied by a ventralmost genital spine. 



Another specimen from Patton escarpment (Sta. 5937) also lacks 

 prostomial eyes or they are obscure black specks fading on preservation. 

 Three pairs of branchiae occur on setigerous segments 3 to 5 ; another 

 pair might have occurred on segment 2, bringing the total to 4 pairs. All 

 but the last pair are thick, tapering and heavily ciliated along the outer 

 edge; the last are pinnately divided only along the outer edge. Neuropodial 

 hooks are present from segment 21 ; they gradually increase in number to 

 form transverse series in posterior segments, where they are accompanied 

 by alternating pointed setae and a ventralmost geniculate spine. 



This individual may be compared with Prionospio nova Annenkova 

 (1938) from North Japan Sea in 5-15 meters, which was described from 



