25. — Part of a radial section through tlie distal part of the choanosomc of var. micrasler; magnified 200; 

 phot. Zeiss, apochr. 8, compens. oc. 6: 



a, mcdiuni-sized oxyaster; b, smaller oxyasters. 

 26. — Radial section through the superficial part of var. mirraster; magnified 20; phot. Zeiss, planar 

 20: 



a, sterraster-armour; b, a chone; c, small dermal styles and anaclades protruding beyond the 

 surface; d, choanosome; e, small dermal styles and anaclailes in the subcortical layer. 

 27. — Part of a radial section of the proximal |)ortion of the choanosome of var. intermedia; magnified 

 200; phot. Zeiss, apochr. 8, compens. oc. 6: 

 a, large oxyasters; b, smaller oxyast«rs. 



