282 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 15 



in parallel series. There are no subuluncini. The uncini are in 3 or 4 

 vertical rows immediately in front of a single row of pointed setae. Ab- 

 dominal notopodia have pointed setae and furcate setae (fig. 5) in 

 which the shaft is slightly spinous on the side with the shorter tine. 



There is some variation in individuals from eastern Pacific regions. 

 In specimens from 885-38 and 888-38, ventral cirri are present from 

 the fourteenth segment and subpodial lobes only between segments 16- 

 21 ; branchiae are present from the twelfth segment and the thorax 

 comprises 19 setigerous segments. In two others from 1021-39, the sub- 

 podial lobes are on segments 19 to 29 and on 20 to 32 respectively; in 

 one from 1450-42, subpodial lobes are on segments 17 to 32; and in 

 another on 19 to 29. In specimens reported from the Korean Archi- 

 pelago, Okuda (1937, pp. 102-103) described subpodial lobes on seg- 

 ments 14-16 to 18-20. 



Distribution. — Scoloplos armiger is widely reported from cosmopoli- 

 tan areas in littoral depths. Its occurrence in California is limited to 

 mixed bottoms in moderate depths (see also Chart for species in San 

 Pedro area, above). 



Scoloplos acmeceps Chamberlin 

 Plate 30, figs. 1-7 



Scoloplos elongata Hilton, 1918, p. 61. 



Scoloplos acmeceps Chamberlin, 1919b, pp. 15-16; Hartman, 1936, p. 

 32; Hartman, 1944c, p. 257. 



Collections.— 887-38 (1); 1211-40 (6); 1441-41 (2); 1442-41 

 (4) ; 1445-42 (3) ; 1450-42 (2) ; 1451-42 (6) ; 1457-42 (6) ; 1471-42 

 (2) ; 1478-42 (1) ; 1479-42 (2) ; 1480-42 (1) ; 1484-42 (4) ; 1493-42 

 (1); 2091-52 (1); 2152-52 (5); 2316-53 (1); 2317-53 (1); 2318-53 

 (4) ; 2320-53 (2) ; many others from various parts of the northeastern 

 Pacific Ocean from southern Alaska south to Mazatlan, Mexico, in 

 littoral zones. 



Larger specimens measure more than 150 mm long, 3 to 4 mm wide, 

 and have more than 200 segments. The anterior two-thirds of the thorax 

 is broadly depressed ; farther back it is less so. The change from thorax 

 to abdomen is variable within limits, between segments 21 to 24 or from 



19 to 26; it is noticeable because of a change in neuropodial lobes and 

 setae. The prostomium is small and inconspicuous and pointed in front; 

 it lacks visible eyespots. Branchiae are first present from segments 14 to 



20 in smaller individuals, or from about segment 25 in larger ones. The 

 first branchiae are small and they increase rapidly in size, standing erect 

 over the dorsum within five to ten segments ; they are heavily fimbriated 

 at the outer lateral margins (fig. 2). 



