10 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 40.' 



Thanks to the work of the ships of the U. S. Coast Survey and the 

 U. S. Fish Commission we have long had data upon which to base a 

 concept of the Antillean crinoid fauna, and we are able to state with 

 a reasonable degree of accuracy that this fauna is directly derived 

 from, and forms the outer fringe of, the great Intermediate area, the 

 maximum intensity of which lies within a triangle whose apices are, 

 roughly, southern Japan, the Kermadec Islands, and Singapore. Just 

 as the genera Antedon and Leptometra characterizing the European 

 faunal area are distinct from, though very closely related to, the 

 parent genera Mastigometra and Psathyrometra of the East Indies, 

 so the genera found in the West Indies are very closely related to, 

 but entirely distinct from, the corresponding East Indian genera. The 

 correspondence is well brought out by the following list : 



WEST INDIAN GENUS. CORRESPONDING EAST INDIAN GENUS. 



Family COMASTERIDiE. 



Nemaster. Capillaster. 



Neocomatella. Comatella. 



Leptonemaster . Comissia. 



Comactinia. Comatula. 



Family IIIMEROMETRID.E. 



Analcidometra. Stephanometra. 



Family THALASSOMETRID/E. 



Stylometra. Cosmiometra. 



n • . IPachi/lometra. 



Crinometra. \Glyptometra. 



Family ANTEDONIDiE. 



Tlypalometra . Enjtlirometra. 



Zenometra. Psathyrometra. 



Coccometra. Thysanometra. 



Certain other genera probably should be paired in the same way, 

 but our data in regard to them is as yet insufficient for generaliza- 

 tion; a number of genera are, of course, common to both regions, 

 though the species are never the same. 



Now the entire western coast of North and South America is, as I 

 have shown, 1 purely Antarctic, or, more precisely, Magellanic, in its 

 affinities; the Indo-Pacific-Japanese species disappear far to the west- 

 ward among the South Sea islands. It is thus highly improbable 

 that the West Indies could ever have become colonized from the 

 westward; if such had been the case there would certainly be traces 



1 Geographical Journal, vol. 32, No. G, p. 002 et seq. 



