_- =. — 
PLATE 36. 
Hyalonema (Hyalonema) obtusum gracilis LENDENFELD. 
Figures 1-45. - 
1-25.— Tetractine acanthophores of the sheaths enclosing the large stalk-spicules in the basal part of 
the sponge-body; magnified 100; phot. Zeiss, apochr. 16, compens. oc. 6: 
1-13, forms with rays not very different in size; 
14-25, forms in which one or two of the rays are markedly reduced. 
26.— Part of an axial section through the basal part of the spongesvoy; magnified 30; pee Zeiss, 
planar 20 mm.: 
a, Space previously occupied by a large stalk-spicule. 
27, 28.— Ray-ends of the tetractine acanthophore of the sheaths enclosing the large stalk-spicules in 
the basal part of the sponge-body; magnified 300; phot. Zeiss, apochr. 4, compens. oc. 6. 
29-36.— Rhabd-acanthophores of the sheaths enclosing the large stalk-spicules in the basal part of the 
sponge-body; magnified 100; phot. Zeiss, apochr. 16, compens. oe. 6: 
29, 32-36, tylostyles; 
30, amphistrongyle; 
31, centrotyle style. 
37, 38.— The two ends of the amphistrongyle acanthophore represented in fig. 30; magnified 300; phot. 
Zeiss, apochr. 4, compens. oc. 6. 7 
39-44.— Diactine acanthophores of the sheaths enclosing the large stalk-spicules in the basal part of the 
sponge-body; magnified 100; phot. Zeiss, apochr. 16, compens. oc. 6: 
39, an angularly bent, slender, centrotyle diactine; 
40-44, slightly curved, stout, centrotyle diactines. 
45.— Strongly curved style acanthophore of the sheaths enclosing the large stalk-spicules in the basal 
part of the sponge-body; magnified 100; phot. Zeiss, apochr. 16, compens. oc. 6. 
