CLARK: RECENT CRINOIDS 



427 



Plotting the averages of all the less speciaHzed (1) and the 

 more specialized (2) characters with and without the averages 

 under the heading ''General" (fig. 1), we find that the more 



80-75 

 75-70 

 70-65 

 66-60 

 60-55 

 55-50 

 50-45 

 *5-40 

 40-J6 

 35-30 

 30-25 



Fig. 1. 



specialized characters predominate above 45°, and the less spe- 

 cialized below, down to 30°-25°, where the more specialized are 

 again in the majority. 



Plotting the excess of the more primitive (1) or of the more 

 specialized (2) at different depths (fig. 2), we find that the more 

 specialized predominate above 45°, and the more primitive be- 

 tween 45° and 30°, while below 30° the more speciaHzed again 

 predominate. 



