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



phot. Zei.ss, q. monoehr. 2.5, q. oc. 5: 

 a, large strongylosphaeraster; b, small strongylosphaerasters. 



22, 23. — Large oxyasters of var. megana; magnified 1200; u. v. phot., Zeiss, q. monoehr. 2.5, q. oc. 10. 

 24, 25. — Group of euasters in a centrifugal spicule-preparation of var. megana; magnified 900; u. v. 



phot. Zeiss, q. monoehr. 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. monoehr. 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. monoehr. 

 1.7, q. oc. 14. 



