156 BULLETIN 75, UNITED STATES NATIONAL MUSEUM, 



arm plates moderate, hardly meeting above or below, at least at 

 base of arm; each plate carries three, and at base of arm, four sharp, 

 rather slender spines, of which the uppermost may be a little the 

 longest and somewhat exceed the joint. Tentacle scales, two, small. 

 Color (dried from alcohol), gray-brown, brownish-yellow, pale gray 

 or nearly white. 



Localities. — Albatross station 2848, off Alaska, lat. 55° 10' N.; 

 long. 160° 18' W., 110 fathoms, green mud, bottom temperature 41°, 

 5 specimens; station 3255, Bering Sea, lat. 56° 33' 30" N.; long. 164° 

 31' 40" W., 43 fathoms, green mud, sand, bottom temperature 37°, 

 5 specimens; station 3529, Bering Sea, lat. 58° 36' N.; long. 172° 24' 

 W., 56 fathoms, green mud, bottom temperature 36.1°, 1 specimen; 

 station 3540, Bermg Sea, lat. 56° 27' N.; long. 166° 8' W., 51 fathoms, 

 green mud, fine sand, bottom temperature 36°, 2 specimens; station 

 4794, Sea of Okhotsk, lat. 52° 47' 20" N.; long. 158° 44' 30" E., 

 58 to 69 fathoms, sand, pebbles, 1 specimen; station 4844, off Korea, 

 lat, 36° 34' N.; long. 132° 50' 20" E., 116 fathoms, green mud, gray 

 sand, globigerina, bottom temperature 35.9°, 1 specimen; station 

 4997, Gulf of Tartary, lat. 47° 38' 40" N.; long. 141° 24' 30" E., 

 318 fathoms, green mud, bottom temperature 32.8°, 2 specimens; 

 station 5010, off Saghalin, lat. 46° 30' 30" N.; long. 142° 43' 30" E., 

 21 to 32 fathoms, green mud, sand, bottom temperature ?, 1 specimen; 

 station 5033, Yezo Strait, lat. 44° 4' 20" N.; long. 145° 28' E., 533 

 fathoms, green mud, fine black sand, bottom temperature 35.9°, 

 2 specimens; lat. 63° 37' N.; long. 165° 19' W., 2 specimens; (liiachi 

 Islands, 20 fathoms, Dall collection, 1 specimen; Iliuliuk, Unalaska, 



1 specimen; off Cape Sabine, Alaska, 4 specimens; 10 miles west of 

 Pomt Franklin, AJaska, 13i fathoms, sand, 1 specimen; Bay of 

 Islands, Adak, Dall collection, 1 specimen; Port Levashef, Alaska, 



2 specimens; off Point Hope, Alaska, 25 fathoms, 1 specimen; Coal 

 Harbor, Unga, 3 specimens; Captains Harbor, Alaska, 15 specimens; 

 Arctic Ocean, 3 specimens; Alaska, 10 specimens; Alaska, Dall col- 

 lection, 11 specimens; Port Clarence, Alaska, 12 fathoms, 5 specimens; 

 Loc. ?, 4 specimens. Bathymetrical range, 12 to 533 fathoms. 

 Temperature range, 41° to 32.8°. Eighty-four specunens. 



Tifpe.— Cat. No. 25613, U.S.N.M., from station 4997. 



These specimens range in disk diameter from 3 to 9 mm. Several, 

 in which the disk is being regenerated, are remarkable for the small 

 size and irregular form of the radial shields. Such specimens, if 

 dark colored, have a striking superficial resemblance, dorsally, to 

 Ophiura maculata, though the ventral view is, of course, quite different. 

 Although this species is nearly related to urtica, it is so much more 

 stoutly built and the disk scales are so much coarser that the two species 

 are not likely to be confused. The adoral plates of craterodmeta and 



