294 U.S. NATIONAL MUSEUM BULLETIN 227 



Abdominal region with paired branchiae. With long ligulate, 

 postsetal notopodial lobes (inner border not ciliated as in S. fragilis 

 and S. robustus) . Without interramal cirri but with interramal ciliated 

 organs near the bases of the notopodia. With bilobed neuropodia, the 

 lobes subequal at first, then the inner lobe becoming longer. With 

 subpodal flanges uniting the neuropodia with the sides of the body, the 

 outer border of the flanges entire but may be undulate. Usually 

 without transitional subpodal papillae (may be 1 extra papilla on last 

 thoracic segment). Proboscis forming a 5-lobed sac. When partially 

 extended, it shows a tubular base with 2 or more lobes distally. Color : 

 light red or pale (with yellow digestive tract showing through) . 



Remarks. — Anthostoma acutum Verrill, 1873a (=;S'. acutus Verrill, 

 1881), has been referred to *S'. armiger by Webster and Benedict 

 (1887, p. 738) and Hartman (1944a, p. 340). The types of A. acutum 

 were examined in the U.S. National Museum. *S'. acutus differs from 

 S. armiger in that it lacks extra papillae in the transitional segments 

 (in S. armiger, there are 1-2 extra subpodal papillae on the last few 

 thoracic and first few abdominal segments, up to 2-20 segments in- 

 volved). S. acutuls appears to have all the thoracic nem-osetae ending 

 in capillary tips (in S. armiger, some crotchets are usually found among 

 the numerous capillary setae). Perhaps some of the records of Scolo- 

 plos kerguelensis Mcintosh, 1885, refer to S. acutus. 



Biology. — Dredged on bottoms of sticky and soft mud, fine to 

 coarse sand and various combinations of mud, sand, gravel, pebbles, 

 rocks, shells, worm and amphipod tubes. Specimens with large 

 yolky coral-pink eggs massed inside were found in Cape Cod Bay, 

 Massachusetts in July (July 24, 1953; July 8, 1954). 



Material examined. — Numerous specimens from Canadian Arctic 

 (Sylvia Grinnel River, Frobischer, Baffin Land, 1942, R. A. Bartlett), 

 Gulf of St. Lawrence (Gaspe Bay, Bay of Chaleurs, 3-60 fathoms), 

 Maine (Ebenecook Harbor, Southport Island, 3-7 fathoms; north end 

 Long Ledge, Sheepscot River, 3 fathoms; Muscongus Bay near Hog 

 Island, 3 fathoms; N.W. Eastern Point Light, 26-45 fathoms), New 

 Hampshire (Isles of Shoals, 27-48 fathoms), Massachusetts (Georges 

 Bank, 37-98 fathoms, R. Wigley; Massachusetts Bay off Pljmiouth, 

 17-26 fathoms; Vineyard Sound, 16-27 fathoms; Cape Cod Bay, 

 13-27 fathoms; Albatross Station 2240, 40°27' N., 70°29' W., 44 

 fathoms). Long Island Sound (Little Peconic Bay, Long Island, 7-14 

 fathoms), off Chesapeake Bay (Albatross Station 2306, 35°21' N., 

 74°52' W., 41 fathoms). 



Distribution. — Canadian Arctic (Baffin Land) to off Chesapeake 

 Bay. In 3 to 98 fathoms. 



