﻿Meristic Variation in the Common Sun-Star. 



77 



Solaster pap2^osiis. It measures 11 cm. across, the diameter 

 of the disc being 5 cm., and the arms, which are of equal 

 length, 3 cm. each. It is clearly an immature specimen, and 



POLYGON OF FREQUENCY. 



• 20 



15 



10 



5 



Q 9 10 II 12 13 14- 15 16 17 



NUMBER OF ARMS. 



smaller than the average of those dredged. The Table also 

 shows that over 57 per cent, are thirteen-armed, and that 

 while 13 per cent, have over that number of arms, 30 per 



