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BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



Geographical range. — From ofT New York and Massachusetts in deep water to 

 southern Greenland, as far as Bredefjord and lat. 65°15' N. in Davis Strait, and eastward 

 to Icehind, the Faroe and Shetland Islands, southwest Ireland and the coasts of Scandi- 

 navia from p.xfjord in East Finmark southward to the full length of the Skagerrak. 



Bathymetric range. — From 28 to 1783 meters, the average depth at which it occurs 

 being 398 meters. 



Thermal range. — From 2.00° C. (a single record of 1.46° C. being probably 

 erroneous) to 8.67° C, the average temperature of the habitat being 4.21° C. 



Table 1" 



-The minimum, maximum, and average depths and temperatures for Hathroraetra sarsi in 

 different parts of the range. 



Occurrence.- — Sir WyviUe Thomson wrote (1872) that more or less complete speci- 

 mens or fragments of this species came up in nearly every one of the deep hauls of the 

 dredge from the Faroe Islands to Gibraltar during the cruises of the Porcupine. 



Prof. Michael Sars said (1861) that this species is not rare on the western coast 

 of Norway (Bergen, Flor0en, Christiansund), though never present in great numbers, 

 in from 91 to 183 meters and more, on stony bottom. On his trip to the northern 

 country in 1857 he found it in pxfjord in 183 meters, the specimens being as large (75 

 mm. in diameter) as those found at Bergen. 



In the Hardangerfjord (Grieg, 1913) this species is scarcer than Antedon petasus, 

 yet it cannot be called rare as it has been recorded from a number of localities on both 

 sides of the fjord in from 100 to 500 meters on hard bottom. 



In Hardangerfjord Jondalsbugt, which is a bay about 2.5 kilometers broad between 

 Jonanes and Saetveit, is bounded on the north by the steep land between Jonanes, 

 Kirken, and Urevik. From the depths of the fjord a deep channel cuts in along the 

 shore to Urevik where close to land depths of from 100 to 200 meters are found. The 

 land falls abruptly toward the channel, and only here and there the descent is broken 

 by small terraces. The sides of the cUffs and these terraces support a rich and varied 

 fauna including this species. 



Tryglavik, just to the north of Jonanes, has a relatively rich fauna, including this 

 species, on a bottom of fine clay mixed with shell sand. 



On the northern side of Straumastein, across the fjord from Jondalsbugt, the 

 narrow terraces along the side of the fjord gradually become broader and along by 

 Eidsvaag and Augestad assume the character of plateaus which slope gradually from 

 the land to a depth of from 200 to 400 meters, thence falling abruptly to the depths 

 of the fjord. Further from land the bottom consists of shell sand more or less mixed 



