EEPORT ON THE ASTEROIDEA. 



239 



Genus Bathybiaster, Danielssen and Koren. 



Bathybiaster, Danielssen and Koren, Nyt Mag. f. Naturvidensk., 1883, Bd. xxvii. 4. Hefte, p. 285 ; Den Norske 

 Nordhavs-Expedition, 1876-78, Zoologi, xi. Asteroidea, 1884, p. 94. 



This genus was established by Danielssen and Koren for a North Atlantic Asterid 

 which had previously l been described by them under the name of Astropecten pallidus. 

 The structure and character of the genus and species are fully discussed and admirably 

 illustrated in their monograph of the Asteroidea collected by the Norwegian North Atlantic 

 Expedition. 



Cliorology of the Genus Bathybiaster. 



a. Geographical distribution : — 



Atlantic : Two species between the parallels of 60° and 80° N. 



Bathybiaster pallidus off the Norwegian coast and Spitzbergen. 

 Bathybiaster vexillifer in the Faeroe Channel. 



Pacific : One species between the parallels of 45° and 55° S. 



Bathybiaster loripes off the western coast of South America, near 

 the entrance to the Strait of Magellan. 



Southern Ocean : One species between the parallels of 45° and 55° S. 



Bathybiaster loripes, var. obesa, off Kerguelen and Heard Island. 



/3. Bathy metrical range : 75 to 1215 fathoms. 



Greatest range of one species : Bathybiaster pallidus, 412 to 1215 fathoms. 



<y. Nature of the Sea-bottom : Bathybiaster loripes is found on Blue mud, and Bathy- 

 biaster loripes, var. obesa, on Volcanic mud. Bathybiaster pallidus is found 

 on Clay, and in its greatest depths on Biloculina clay. 



Chorological Synopsis of the Species. 



1 Nyt Mag.f. Naturvidensk, 1877, Bd. xxiii. 3die Hefte, p. 62, tab. iii. figs. 1-7. 



