NO. 7 SEA-LILIES AND FEATHER-STARS — CLARK 25 



The published records show in the feather-stars the following 

 frequency for the various colors ; the numbers in parentheses show 

 the individuals entirely of the color given, the others all the records 

 for that color both in unicolor and in variegated types : 



Yellow 194 (47) Black 43 (3) 



Brown 138(24') Orange 39 (5) 



White 126 (l) Gray 22 (i) 



Red 80 (8) Violet 15 (6) 



Green 74 (7) Blue 15 (0) 



Purple 70 (10) 



While white and yellow occur in all possible combinations, orange 

 does not occur with violet, black or green ; red does not occur with 

 black ; purple does not occur with black, gray or green ; violet does 

 not occur with orange, black, gray or brown ; black does not occur 

 with orange, red, purple, violet, gray, green, or brown ; gray does not 

 occur with purple, violet, black, green or brown ; green does not occur 

 with purple, black or gray ; and brown does not occur with red, violet, 

 black or gray. 



It is of course true that this apparent incompatibility of colors is 

 partly due to a lack of observations and to a misinterpretation of the 

 colors as recorded, and the foregoing list must therefore be accepted 

 with considerable reservation. 



In particolored comatulids the distribution of the colors on the 

 arms and pinnules falls into several well-marked types, which may be 

 arranged as follows : 



1. Arms and pinnules uniform in color. 



a. Arms and pinnules uniform in color, but differing in 



color from the cirri. 



b. Arms and pinnules uniform in color, but the ventral and 



dorsal surface of different colors. 

 II. Pinnules of a different color from that of the arms. 



a. The distal portion of the pinnules (and usually also the 

 arm tips) is of a different color from that of the proxi- 

 mal portion and the arms. 



h. All of the pinnules are of a color different from that of 

 the arms. 



III. Arms and pinnules irregularly spotted, mottled and blotched. 



IV. Arms with more or less regular and uniform spots. 



a. Spots confined to the division series and arm bases. 

 h. Numerous small spots generally distributed. 



