THE APODOUS HOLOTHTJRIAXS 27 



whitish in color. In life, the largest must have been over 30 cm. long and about 

 15 mm. in diameter, but most of the specimens of approximately the same color 

 and general appearance are much smaller, 10-15 cm. in length. The wheel- 

 papillas are usually in a single row, and that is apparently in the mid-dorsal in- 

 terambulacrum. These specimens, I believe, represent Eschscholtz 's species dis- 

 color, as shown by the habits as well as the habitat, for they are said to be 

 "common in mud, under rocks." Eschscholtz, however, says that discolor has 

 15 tentacles, 12 large and 3 small, while all the specimens I have examined (save 

 1 with 9) have 12 tentacles. Moreover, he says that there is on each of 3 inter- 

 radii a single row of large white spots (the wheel-papillae, doubtless) ; while 

 most of the specimens before me have only one, many have none, a few have 2, 

 several 3, and one 5. In spite of these differences, the fact that this seems to 

 be the abundant littoral chiridota of Alaska makes it very probable that it is 

 the species Eschscholtz was describing. I have accordingly referred the fol- 

 lowing 207 specimens to discolor: 



1 specimen from Arctic Ocean. 



11 specimens from Alaska. 

 16 " " Kazan Bay, Atka, Alaska. 



20 " Atka Island, Alaska. 



3 " Port Etches, Alaska. 



4 " Eobben Island, Siberia, 50 m. 

 1 specimen from Bering Island. 



7 specimens from lat. 65 25' 28" N., long. 171 11' 26" W. 

 18 " " "Albatross" Station 2852, lat. 55 15' N., long. 170 33' W., 74 m. 



1 specimen " " " 2853, lat. 56 N., long. 154 20' W., 286 m. 



2 specimens " " " 2871, lat. 46 55' N"., long. 125 11' W., 1,006 m. 



2 " " " 2928, lat. 32 47' 30" N., long. 118 10' W., 750 m. 



4 " " " 3077, lat. 55 46' K, long. 132 24' W., 580 m. 



30 " " " 3227, lat. 54 36' 30" N., long. 166 54' W., 405 m. 



11 " " " 3310, lat. 53 56' 51" K, long. 166 28' 53" W., 



104 m. 



5 " 3324, lat. 53 33' 50" N., long. 167 46' 50" W., 



196 m. 

 2 " " " 3326, lat. 53 40' 25" N., long. 167 41' 40" W., 



1,037 m. 

 2 " " " " 3329, lat. 53 56' 50" N., long. 167 8' 15" W., 



720 m. 



20 " " " " 3439, lat. 57 06' N., long. 170 33' W., 74 m. 



2 " " " " 4227, near Naha Bay, Alaska, 111-117 m. 



45 " with no label. 



207 " from 21 stations. 



Many of these specimens are in poor condition, some so very poor as to 

 make positive identification impossible. It is not unreasonable to suppose that 

 if this great mass of material could have been carefully studied when living, it 



