liEFOET ON THE ASTEROIDEA. 



359 



Clwrology of the Genus Porania. 



a. Geographical distribution : — 



Atlantic : Three species, — two between the parallels of 35° and 70° N., and one 

 between the parallels of 50° and 60° S. 



Porania pulvillus, off the coasts of Scandinavia and Britain. 

 Porania grandis, off the coast of the United States of North America. 

 Porania antarctica, from South Georgia {fide Studer), and extending 

 into the Southern Ocean. 



Southern Ocean : Three species between the parallels of 40° and 60° S. 



Porania glaber and Porania antarctica, from Kerguelen, the 

 latter also off Marion Island, Prince Edward Island, and the Crozet 

 Islands. Porania spiculata, off Heard Island, and extending into 

 the Eastern Archipelago. 



Eastern Archipelago : One species between the parallels of 0° and 10° S. 



Porania spiculata, off the Arrou Islands, and extending into the 

 Southern Ocean to Heard Island. 



Pacific : One species between the parallels of 40° and 60° S. 



Porania magellanica, off the coast of Patagonia, and in the Strait 

 of Magellan. 



/3. Bathymetrical range: 15 to 1600 fathoms. 



Greatest range of one species : Porania antarctica, 50 to 1600 fathoms. 



y. Nature of the Sea-bottom: Porania spicidata is found on Gravel, Volcanic mud 

 and Green mud ; Porania magellanica on Green sand ; and Porania antarctica 

 on Diatom ooze in 1600 fathoms. 



Cliorological Synopsis of the Spiecies. 



