46 BULLETIN 70, UNITED STATES NATIONAL MUSEUM. 



3053, off Oregon, lat. 44 4' 30" N.; long. 124 50' W, 64 fathoms, 

 coral, broken shells, rocky, bottom temperature 47.3, 3 specimens; 

 station 3059, off Oregon, lat. 44 56' N.; long. 124 12' 30" W., 77 

 fathoms, mud, bottom temperature 45.1, 9 specimens; station 3064, 

 off Oregon, lat. 46 3' 15" N.; long. 124 9' W., 46 fathoms, fine gray 

 sand, gravel, bottom temperature 45.6, 9 specimens; station 3078, 

 off Oregon, lat. 43 59' 15" N.; long. 124 46' W., 68 fathoms, gray 

 mud, bottom temperature 45.7, 1 specimen; station 3114, off Cali- 

 fornia, lat. 37 6' N.; long. 122 32' W., 62 fathoms, mud, bottom 

 temperature ?, 185 specimens; station 3147, off California, lat. 37 N.; 

 long. 122 20' W., 56 fathoms, brown mud, bottom temperature 49.2, 

 45 specimens; station 3148, off California, lat. 37 8' N.; long. 122 

 28' 10" W., 47 fathoms, brown mud, bottom temperature 51.3, 56 

 specimens; station 3173, off California, lat. 38 19' 25" N.; long. 123 

 14' 30" W., 62 fathoms, mud, bottom temperature 48.2, 12 speci- 

 mens; station 3350, off California, lat. 38 58' 10" N.; long. 123 57' 

 5" W., 75 fathoms, fine sand, mud, bottom temperature 48.4, 3 

 specimens; station 3671, off California, lat. 37 N.; long. 122 20' AV., 

 56 fathoms, green mud, sand, 20 specimens; Sitka, 15 fathoms, 10 speci- 

 mens; Bellkoffsky Bay, 15 to 25 fathoms, shells, 4 specimens; un- 

 known stations, 72 specimens. Bathymetrical range, 15 to 238 fath- 

 oms. Temperature range, 51.3 to 39.8. Six hundred and fifty- 

 eight specimens. 



Among these 658 specimens, the diameter of the disk ranges from 

 7 to 27 mm., and there is some diversity of color, but the appearance 

 of the arm comb and the length of the arm spines show surprisingly 

 little variety. One of the specimens from station 2858 is perfectly 

 tetramerous. The characteristic color of this species is bright gray, 

 with whitish and blackish markings on the disk and particularly on 

 the distal half of the oral interbrachial spaces. These light and dark 

 spots are occasionally present also on the arms. The lower surface 

 of the entire animal is nearly white. In many specimens the light 

 spots of the disk are very conspicuous, but it is quite as common to 

 find specimens on which there are no markings of any kind. The 

 general structure of lutkeni, is, as a rule, lighter and handsomer than 

 that of sarsii, and the disk is commonly distinctly pentangular rather 

 than circular. Some specimens, however, at first sight, are hard to 

 distinguish from sarsii, but in every such case the arm comb oilers 

 an unmistakable character, the wide, truncate, closely-crowded papil- 

 lae of lutlceni being entirely unlike those of any specimen of sarsii 

 which I have ever seen. There can be no doubt that lutkeni on the 

 western American coast and Tdribergi on the eastern Asiatic coast are 

 southern forms of sarsii, for which species the center of abundance 

 in the eastern hemisphere is undoubtedly in the vicinity of the Aleu- 

 tian Islands and in Bering Sea. 



