538 



THE AMERICAN NATURALIST 



[Vol. XLIX 



The Asymmetrical Features m Detail 

 In the following list are given the four types of asym- 

 metry occurring in the recent crinoids, with their geo- 

 graphical distribution and the genera in which they are 

 found. 



1. Disk Not Radially Symmetrical 

 Geographical Distribution. — Southern Japan south- 

 ward to Samoa, Fiji and southern Australia, thence west- 



ward to east Africa, from the Red Sea to the Cape; north- 

 western Africa and southwestern Europe (in moderately 

 deep water), and from South Carolina to Brazil ; antarctic 

 regions, littoral to abyssal, and northward along the 



