PLATE 101. 
Hyalonema (Skianema) aequatoriale LeNDENFELD. 
Figures 1-3. 
1.— Radial section through the marginal part of the sponge; magnified 20; phot. Zeiss, planar 20 mm.: 
a, gastral face; b, dermal face. 
2.— Radial section through the gastral membrane and the adjacent parts of the choanosome; magnified 
100; phot. Zeiss, apochr. 16, compens. oc. 6: 
a, gastral pinule-fur; b, gastral membrane; c, small macramphidises protruding over the 
gastral membrane; d, large macramphidiscs in the subgastral region. 
3.— Paratangential section through the gastral membrane, containing the zone occupied by the lateral 
rays of the pinules. 
Hyalonema (Skianema) umbraculum LENDENFELD. 
Figures 4-17. 
4—7.— Microhexactines; magnified 200; phot. Zeiss, apochr. 8, compens. oc. 6. 
8, 9.— An abnormal large macramphidisc; magnified 500; phot. Zeiss, apochr. 8, compens. oc. 12: 
8, focussed high (on the uppermost teeth); 9, focussed lower (on the shaft). 
10.— Half (one anchor) of an abnormal large macramphidise; magnified 500; phot. Zeiss, apochr. 8, 
compens. oc. 12. 
11-13.— Parts of microhexactines (11, 13) and a whole one (12); magnified 500; phot. Zeiss, H. I. 
apochr. 2, compens. oc. 6. 
14.— A diactine microhexactine-derivate; magnified 500; phot. Zeiss, H. I. apochr. 2, compens. oc. 6. 
15-17.— Acanthophores; magnified 200; phot. Zeiss, apochr. 8, compens. oc. 6. 
