ERYLUS ROTUNDUS. 



DIMENSIONS OF ACANTHTYLASTERS (continued). 



303 



Acanthtylasters 



Erylus rotund us 



var. megarliabda 



var. typica 



var. 

 cidaris 



all varieties 



A 



B 



all forms 



A 



B 



C 



D 



all forms 



South Molokai 



Kauai 



South Molokai 



Kauai, dark specimen 



Kauai, hght specimen 



Northeast Hawaii 



with three 

 rays 



total diameter, 



23 





23 





23-29 







23-29 



25-28 



2.3-29 



basal thick- 

 ness of rays, // 



1.4 





1.4 





1.2- 

 1.4 







1.2- 

 1.4 



1.4- 

 1.9 



1.2- 

 1.9 



diameter of 

 acanthtyle 

 (roundeil end), /i 



2.7 





2.7 





2-2.1 







2-2.1 



1.6- 

 2.7 



1.6- 

 2.7 



wi(h four 

 to six 

 rays 



total diameter, 

 /< 



16-27 



16-26 



16-27 



19-30 



17-31 



17-23 



18-26 



17-31 



16-26 



16-31 



basal thickness 

 of rays, /i 



0.8-2 



0.8-1 



0.8-2 



0.7-2 



0.8- 

 1.7 



0.5-2 



1.2- 

 1.5 



0.5-2 



1-2.4 



0.5- 

 2.4 



diameter of 

 acanthtyle 

 (rounded end), p 



1.3- 

 3.5 



1.3- 

 1.8 



1.3- 

 3.5 



1.5- 

 3.5 



1.2- 

 2.4 



1-4 



1.5- 

 2.2 



1-4 



2-3 



1-4 



with seven 

 to nine 

 rays 



total diameter, 



/' 



16-21 



14 23 



14-23 



15-19 



16-24 



1,5-24 



17-18 



15-24 



16-21 



14-24 



basal thickness 

 of rays, /( 



0.8- 

 1.4 



0.7- 

 1.5 



0.7- 

 1.5 



1.2 



0.9- 

 1.3 



0.6- 

 1.2 



1.2 



0.6- 

 1.3 



1-1.7 



0.6- 

 1.7 



diameter of 

 acanthtyle 

 (rounded end), /! 



1-2.3 



1.3-2 



1-2.3 



1.5 



1.3-2 



0.5-2 



1.5 



0..5-2 



1.5- 

 2 2 



0.5- 

 2.3 



with ten to 

 fourteen 

 rays 



total diameter, 



I'- 



13-19 



12-17 



12-19 



12-17 



15-19 



13-16 



16 



15-19 



13 



12-19 



basal thickness 

 of rays, /< 



0.6- 

 1.5 



0.5- 

 1.2 



0.5- 

 1.5 



0.6- 

 1.1 



0.5- 

 1.3 



0.8- 

 1.2 



0.7 



0..5- 

 1.3 



1 



0.5- 

 1.5 



diameter of 

 acanthtyle 

 (rounded end), /< 



1.2 

 2.1 



1-1.8 



1-2.1 



1-1.6 



0.7-2 



1.2- 

 1.8 



1.2 



0.2-2 



1.2 



0.7- 

 2.1 



