140 BULLETIN 82, UNITED STATES NATIONAL MUSEUM VOLUME 1 



in that district. He suggested that Troms0 is probably a mistake for Trom0, near 

 Arendal. 



Helga sta. W. 5; Irish Fisheries, March 23, 1904; 5 miles SW. by W. of Great 

 Skellig, County Kerry; 109-119 meters [A. H. Clark, 1913].=Antedon bifida. 



Helga sta. S.R. 360; Irish Fisheries, August 8, 1906; west of Dingle Bay (lat. 52 

 04' N., long. 1127' W.); 198-220 meters [A. H. Clark, 1913].= A bifida. 



Pourquoi Pas? sta. 60; English Channel Gat. 4951' N., long. 221' W.); 162 

 meters [Vaney, 1914]. =A bifida. 



Geographical range. From southwestern Iceland to the Faroe Islands and Scan- 

 dinavia, where it ranges from Trondhjemsfjord (lat. 6340' N.) southward along the 

 Norwegian and western Swedish coasts to Bohuslan and the Kattegat. 



Bathy metrical range. From 10 to 326 meters; most frequently recorded from 

 between 90 and 150 meters. 



Occurrence. Prof. Michael Sars wrote in 1861 that this species is rather frequent 

 in certain localities on the southern coast of Norway, as well as in the Kristianiafjord, 

 at depths of from 36 to 183 meters on rocky bottom. 



On the Bergen coast it is less common than Hathrometra sarsi. There he found 

 small individuals frequently on a hard clay bottom in from 90 to 130 meters. 



Prof. C. Boeck found it at Aun0, Hitteren; also in the Trondhjemsfjord, which 

 was the northernmost locality known to Professor Sars, he found it almost as large as 

 in the Kristianiafjord. 



On the Norwegian coasts, generally speaking, this species is local, though often 

 abundant, especially where there are sponges (Appell0f, 1905). 



In 1896 Grieg noted that this species is very common in most of the localities 

 from which he at that time reported it; that is, in Hardangerfjord, Selb0fjord, Korsfjord, 

 Bj0rnefjord, Hjeltefjord, Mangerfjord, Bergensfjord, Herl0fjord, Sognefjord and 

 S0ndfjord. 



Grieg (1898) has given a detailed account of the localities inhabited by this animal 

 in Vaagsi'jord. 



From Bergsholmerne, the group of "holms" or small high islands which lie be- 

 tween Bergnakken and Vaagsvaagen, there extends a submarine plateau reaching 

 down toward the Husvaagsholmerne. The outermost edge of this plateau, called 

 Raaseskallen, lies approximately in the middle of the fjord, in from 73 to 109 meters. 

 Both toward the south and toward the east, that is toward the inner part of the fjord, 

 the plateau descends steeply to the depths of the fjord which is here from 183 to 274 

 meters deep. Toward the west, or toward the mouth of the fjord, the channel which 

 cuts in from the Vaagsfjord toward the Vaagsvaagen, the plateau descends very grad- 

 ually. The summit of the plateau consists of sand and gravel which in the shallowest 

 places, toward the Bergsholmerne, is overgrown with Laminaria. The fauna is very 

 rich and includes this species. 



Along the steep declivity which extends from Halnaesvik over toward Saetenaes 

 the conditions regarding depth are like those at Halnaesvik, but the bottom consists 

 mainly of coarse gravel and loose rocks; only here and there are these interrupted by 

 a few patches of sand. From Saetenaes eastward past the south side of Mold0ens, 

 Kletten, and Blaalilandet to Skav0en, there is only shell sand with a fauna which 

 resembles that in the southern part of Ulvesund. The deeps slowly descend to 55 or 

 73 meters, where the bottom abruptly falls off to the depths of the fjord. The 73 



