21.- Group of euasters in a centrifugal spicule-preparation of var. microana; magnifie.! 600; u. v. 

 phot. Zeiss, q. monochr. 2.5, q. oc. 5: 



a large strongylosphaeraster; b, small strongylosphaerasters. 

 22 -^3- Large oxyasters of var. in^gana; magnified 1200; u. v. phot., Zeiss, q. monochr. 2.5, q. oc. 10. 

 24! 25'.- Group of euasters in a centrifugal spicule-preparation of var. megaTm: magnified 900; u. v. 

 phot. Zeiss, q. monochr. 2.5, q. oc. 7: 

 24, focused higher; 25, focused lower; 



a large oxyaster with slender rays; b, medium oxyasters; c, small strongylosphaeraster. 

 26-31.- Tips of rays of oxyasters of var. megana: magnified 2650; u. v. phot., Zeiss, q. monochr. 1.7, 

 q. oc. 14: 



26, a nearly smooth ray; 



27, a slightly spined ray; 



28-31, strongly spined rays. , , „ ■ . 



32.- Two small strongylosphaerasters of var. megana; magnified 2650; u. v phot., Zeiss, q. monochr. 



1.7, q. oc. 14. 



