76 CLARK: DISTRIBUTION OF CRINOIDS 



la7'is E. Mey., 1849); C. bidentata (Achyranthes bidentata Blume, 1825); 

 C. breviflora {Achyranthes hreviflora Baker, 1897); C. canescens {Achy- 

 ranthes canescens R. Br., 1810); C. carsoni {Achyranthes carsoni Baker, 

 1897); C. conferta {Achyranthes conferta Schinz, 1896); C. elegantissima 

 {Achyranthes elegantissima Schinz, 1895); C. fasciculata {Achyranthes 

 fasciculata Schweinf., 1867); C. flabellifera {Achyranthes flabelUfera 

 Boerl., 1891); C. fruticosa {Achyranthes fruticosa Lam., 1783); C. 

 grandifolia {Achijranthes grandifolia Moq., 1849); C. heudelotii {Achy- 

 ranthes heudelotii Moq., 1849); C. involucrata {Achyranthes involucrata 

 Moq., 1849); C. schinzii Standley, nom. nov. {Achyranthes lanuginosa 

 Schinz, 1895, not A. lanuginosa Nutt., 1820); C. mauritiana {Achyran- 

 thes mauritiana Moq., 1849); C. moquini Standley, nom. nov. {Achy- 

 ranthes javanica Moq., 1849, not A. javanica Pers,, 1805); C. oblanceo- 

 lata {Achyranthes ohlanceolata Schinz, 1895); C. ovata {Achyranthes 

 ovata Ehrenb., 1867); C. schweinfurthii {Achyranthes SQhweinfurthii 

 Schinz, 1896); C. splendens {Achyranthes splendens Mart., 1849); 

 C. velutina {Achyranthes velutina Hook. & Arn., 1841); C. welwitschii 

 {Achyranthes welwitschii Schinz, 1895). 



ZOOLOGY. — The baihymetrical distribution of the Arctic and Ant- 

 arctic crinoids.^ Austin H. Clark, National Museum. 



In their bathymetrical distribution the crinoids of the Arctic 

 and Antarctic Oceans are most interesting. I have already^ pre- 

 sented the reasons for considering the crinoids of the Atlantic, 

 from the standpoint of their systematic interrelationships, and 

 of their geographical distribution, as representing merely the 

 fauna of an inland sea, derived from the fauna of the Indo-Pacific 

 as a parent, the crinoids of the Arctic Ocean representing also 

 an inland sea fauna derived in part from the Bay of Bengal 

 direct, and in part from the adjacent portion of the Atlantic. 

 The fauna of the Antarctic Ocean is merely the southerly ex- 

 tension of the deep water fauna of the Indo-Pacific Ocean. 



Examining the diagram (fig. 1), we find that the line repre- 

 senting the Antarctic fauna, and that representing the Antarctic 

 and the Arctic faunas combined, are strikingly similar to the line 



1 Published with the permission of the Secretary of the Smithsonian 

 Institution. 



2 Internationale Revue der gesamten Hydrobiologie und Hydrographie, 1914. 



