280 U-S. NATIONAL MUSEUM BULLETIN 227 



posterior row of longer capillary setae similar to the notosetae. 

 Crotchets crenulate, notched or hooded at the tip (fig. 74c). 



Abdominal region with parapodia directed dorsally. Notopodia 

 with erect digitiform postsetal lobes and notosetae similar to the 

 thoracic region. Neuropodia bilobed, lower lip longer and thicker 

 than the upper lip, with few long slender crenulate capillary setae and 

 few acicula with cm"ved projecting tips. Pygidium with 4 bluntly 

 rounded lobes, dorsal, ventral, and lateral, with four short cylindrical 

 anal cirri alternating with the lobes. Proboscis simple, sachke (fully 

 extended?). Color: yellowish, pale pink, rose gray or nearly colorless, 

 with red branchiae and middorsal blood vessel. 



Biology. — Found at low water on rocky shores, with algae, in tide 

 pools, on soft bottom under stones, among shells, in sand among 

 byssus threads of mussels (as Modiolus modiolus) under encrusting 

 calcareous algae (as Lithothamnion) , in holdfasts of Laminaria, in 

 scrapings from pilings among large barnacles. They were found at 

 several stations in the oceanographic fouling studies in the New 

 England area. Dredged on bottoms of mud, sand, gravel, and among 

 the sandy tunicate Amaroecium pellucidum. In Iceland, females with 

 ripe yellow eggs were found in spring and autumn, the spawning season 

 lasting nearly half a year (Saemundsson, 1918). In Maine, females 

 with large yolky eggs were found in April (Sea Point, April 3, 1954). 



Material examined. — Gulf of St. Lawrence (St. Lawrence estu- 

 ary, Bay of Chaleurs, Anticosti Island), Newfoundland, Nova Scotia, 

 New Brunswick (St. Andrews), Maine (Rockland, Gulf of Maine, 

 Boothbay Harbor region, Casco Bay, York, Sea Point near Kittery), 

 New Hampshire (Isles of Shoals), Alassachusetts (Georges Bank, 

 15-47 fathoms, R. Wigley; Cape Cod Bay, vicinity of Nantucket), 

 Alaska (Constantine Harbor, Amchitka Island, 1873, W. H. Dall; 

 Lagoon Reef, St. Paul Island). 



Distribution. — Widely distributed in the Arctic, north Japan Sea, 

 Alaska, Iceland, Faroes, Shetlands, Norway to France, Gulf of St. 

 Lawrence, Newfoundland to Massachusetts (Cape Cod Bay, 

 Nantucket). Low water to 1,110 fathoms. 



Genus Orbinia Quatrefages, 1866 



Aricia Savigny, 1820, preoccupied by R. L. (1817, Lepidoptera) ; type (mono- 

 typy) : Aricia sertulata Savigny, 1820. 



Type (original designation): Orbinia sertulata (Savigny, 1820). 



Subgenus Phylo Kinberg, 1866; emend. Hartman, 1949 



Type (monotypy): Phylo felix Kinberg, 1866. 



AH the species represented have the body divided into anterior 

 thoracic and posterior abdominal regions. Thoracic region more or 



