POLYCHAETE WORMS, PART 1 53 



Without dorsal cirri on segment 3. Elytra without lateral fringe; some of more 

 posterior elytra may have shallow lateral incision. Median antenna without 

 antenna! ctenidia on short ceratophore; style short (about same length as 

 prostomium; fig. 11/) L. hystricis 



Leanira tetragona (Oersted, 1845a) 



Figure IOp 



Leanira tetragona Verrill, 1881, pp. 304, 307. — Whiteaves, 1901, p. 84.— Fauvel, 

 1923, p. 117, fig. 43,a-fir.— Wesenberg-Lund, 1951, p. 21.— Clark, 1960, p. 14.— 

 Eliason, 1962, p. 223. 



Description. — Length up to 200 mm., width iiickiding setae up to 

 8 mm., segments up to 300 or more. Prostomium rounded, bilobed, 

 without eyes. Cirriform branchiae begin on segment 6 (rudimentary 

 ones on 4, 5); with parapodial ctenidia in groups of 3 in the concave 

 area above the notopodia. 



Biology. — ^Dredged on bottoms of mud, mud and sand, sand and 

 stones, rocks, with red algae. A female with large yolky eggs in body 

 was found in plankton {Grampus Station 10249, 42°37' N., 69°38' W., 

 125-0 fathoms, August 22, 1914). Found in stomach of haddock 

 (Georges Bank, January 1954, R. Wigley). 



Material examined. — Gulf of St. Lawrence (south of Anticosti 

 Island), Gulf of Maine, Georges Bank, Massachusetts, to ofi Chesa- 

 peake Bay, in 22 to 906 fathoms; also in plankton, 125-0 fathoms. 



Distribution. — Scattered records in the Arctic (Davis Strait, Sibe- 

 rian Ai'ctic). Also Gulf of St. Lawrence to off Chesapeake Bay, 

 Iceland, Norway to Azores, Mediterranean, Adriatic. In 22 to 1,200 

 fathoms. 



Leanira hystricis Ehlers, 1875 



Figure 11/ 



Leanira robusla Verrill, 1885a, pi. 40, fig. 175; 1885b, p. 426.— Hartman, 1942c, 



p. 104, fig. 8a; 1944a, p. 337, pi. 14, fig. 10. 

 Leanira alba Moore, 1910, p. 387, pi. 33, figs. 99-104. 

 Leanira hystricis Fauvel, 1923, p. 118, fig. 43, /i-?n. — Hartman, 1942c, p. 105. — • 



Miner, 1950, p. 312. pi. 102.— Wesenberg-Lund, 1951, p. 21. 



Description. — Length up to 100 mm. or more (largest specimens 

 broken and incomplete), width including setae up to 9 mm., segments 

 up to GO or more. Prostomium rounded, without eyes (if present, 

 deeply buried). Cirriform branchiae begin on about segments 21-27 

 (may be small rudimentary ones more anteriorly) ; parapodial ctenidia 

 in the concave area above the notopodia form an almost continuous 

 ciliated area. 



Biology. — Dredged on bottoms of mud. 



Material examined. — Massachusetts (Martha's Vineyard), oft' 

 Rhode Island, north of Puerto Rico, oft" southern California (San 

 Diego), in 100 to 046 fathoms. 



