BENTHIC POLYCHAETOUS ANNELIDS — REISH 141 



Family Paraonidae 



Aricidea suecicai Eliason 



Aricidea suecica Eliason, 1920, pp. 52-55, figs. 14-15. 



Material: Station 19(1). An anterior fragment comes from Bering 

 Sea from fine sand in 132 feet. 



Remarks: Only an anterior fragment present in these collections. 

 It resembles A. suecica Eliason as reported by Hartman (1948) 

 as A. heteroseta Hartman (see Hartman, 1957, pp. 318-319), but 

 since this specimen lacked a posterior end, positive identification 

 could not be made. Aricidea suecica is known from Denmark, British 

 Isles, southern Alaska, and possibly (fide Hartman, 1957) western 

 Canada and Russian Arctic locaHties. 



Paraonis gracilis (Tauber) 



Aonides gracilis Tauber, 1879, p. 115. 



Paraonis gracilis. — Uschakov, 1955, p. 286, pi. 103, figs. A, B. — Hartman, 1957, 

 pp. 330-331, pi. 44, figs. 4-5. 



Material: Stations 5(2), 17(1), 35(6), 43(1), 50(1), 57(1), G-4(l); 

 Bering and Chukchi Seas; sandy silt or silty sand. 



Distribution: Widely distributed from the Arctic to the Antarctic 

 in the Atlantic, the Russian Pacific, and the Bering and Chukchi 

 Seas. 



Family Magelonidae 



Magelona alata, new species 



Figure 2 



Material: Stations 5(4), 7(1), 15(1), 17(1), 19(1), 34(1), 35(2), 49(1), 

 50(4), 57(1), and 60(3); Bering Sea and Beaufort Seas. 



Description: Three of 24 specimens complete and in poor condition. 

 Length 4-5 mm. with 22-27 setigerous segments. Some incomplete 

 specimens 4 to 20 mm. in length with 7-65 setigerous segments. 

 Holotype incomplete, 12 mm. long with 17 segments. One specimen 

 from Station 50 with brown pigment laterally on segments 8-17; all 

 other specimens colorless. Pygidium lacking anal processes. 



Prostomium broad with frontal horns (fig. 2a) ; with crescent-shaped 

 cephalic ridges. Two palpi generally present, densely papillated. 



Parapodia of segments 1-8 similar (fig. 2b), notopodium with small 

 presetal lobe, well-developed folioceous postsetal lobe. Dorsal cirrus 

 becoming progressively smaller towards posterior thoracic region. 

 Neuropodial presetal lobe small, postsetal lobe folioceous but becom- 

 ing small in posterior thoracic region. Single-winged capillary setae 

 (fig. 2c), numbering about 20 per each lobe of parapodium, present 

 through segment 9. Segment 9 constricted. 



