52 BULLETIN 75, UNITED STATES NATIONAL MUSEUM. 



with broad upper ends; each scale carries, orally, a crowded 

 series of minute papillae, which elongate as we pass upward and 

 form a conspicuous arm comb ; as seen from above this comb consists 

 of ten or a dozen long, very slender spinelets, middle ones longest. 

 More or less of a secondary comb is often developed on arm plates 

 beneath true comb. First under arm plate about three times as wide 

 as long; succeeding plates wider than long, more or less triangular, 

 diamond shaped or elliptical; all widely separated from each other. 

 Side arm plates large but low, meeting broadly on under side of arm, 

 but widely separated above except at tip of arm, where they nearly 

 meet; each plate carries three slender, sharp arm spines, uppermost 

 distinctly longest and equaling or exceeding joint. Tentacle pores 

 large, oral one opening into mouth angle and protected by five or six 

 scales on each side, those of inner side somewhat larger; at first 

 arm pore three or four slender, spine-like scales stand on side arm 

 plate and two or three on under arm plate; on succeeding pores, scales 

 of side arm plate soon become reduced to two and at middle of arm to 

 one; those of under arm plate disappear altogether after the first 

 three or four pores. Color (dried from alcohol), white, yellowish, or 

 very pale gray. 



Localities. — Albatross station 2859, off Alaska, lat. .55° 20' N. ; long. 

 136° 20' W., 1,569 fathoms, gray ooze, bottom temperature 34.9°, 3 

 specimens; station 2860, off British Columbia, lat. 51° 23' N. ; long. 

 130° 34' W., 876 fathoms, green mud, bottom temperature 36.5°, 57 

 specimens; station 2863, off Washington, lat. 48° 58' N. ; long. 123° 

 10' W., 67 fathoms, fine sand, black specks, bottom temperature 

 48.5°, 123 specimens; station 2871, off Washington, lat. 46° 55' N.; 

 long. 125° 11' W., 559 fathoms, brown ooze, bottom temperature 

 38.4°, 9 specimens; station 3069, off Washington, lat. 47° 25' 30" N.; 

 long. 125° 42' W., 760 fathoms, green mud, bottom temperature 

 37.6°, 74 specimens; station 3070, off Washington, lat. 47° 29' 30" 

 N. ; long. 125° 43' W., 636 fathoms, green mud, bottom temperature 

 37.6°, 14 specimens; station 3071, off Washington, lat. 47° 29' N.; 

 long. 125° 33' 30" W., 685 fathoms, green mud, bottom temperature 

 38°, 11 specimens; station 3075, off Washington, lat. 47° 22' N.; long. 

 125° 41' W., 859 fathoms, green mud, bottom temperature 36.6°, 19 

 specimens; station 3227, Bering Sea, lat. 54° 36' 30" N. ; long. 166° 

 54' W., 225 fathoms, green mud, bottom temperature 38.6°, 155 

 specimens, station 3324, Bering Sea, lat. 53° 33' 50" N. ; long. 167° 

 46' 50" W., 109 fathoms, coarse black sand, gravel, rocks, 1 specimen; 

 station 3329, Bering Sea, lat. 53° 56' 50" N.; long. 167° 8' 15" W., 

 399 fathoms, fine black sand, bottom temperature 37.7°, 35 speci- 

 mens; station 3331, Bering Sea, lat. 54° 1' 40" N. ; long. 166° 48' 50" 

 W., 350 fathoms, mud, bottom temperature, 22 specimens; station 

 3332, Bering Sea, lat. 54° 2' 50" N.; long. 166° 45' W., 406 fathoms, 



