426 CLARK: RECENT CRINOIDS 



The frequency of the characters in the contrasted pairs (which 

 are the same as those described in the preceding paper) at differ- 

 ent temperatures are as follows; as before, the columns headed 

 ^'1" represent the more primitive characters, those headed "2" 

 the more specialized. 



TABLE 1 



Degrees Calyx Column Disk Arms Pinnules General 



Expressed as percentages of the whole number in each category 

 these figures are as follows: 



The average for all the columns headed "V and for all of 

 those headed "2" with and without the column headed '^ Gen- 

 eral," are as follows: 



