PLATE 58. 
Hyalonema (Prionema) azuerone LENDENFELD. 
Figures 1-22. 
1.— Part of a section through the choanosome, showing a canal-wall; magnified 100; phot. Zeiss, 
apochr. 16, compens. oc. 6: 
a, canal-wall; b, canalar pinules; ec, microhexactines; d, micramphidises. 
2.— Part of a section through the choanosome, showing a region particularly rich in small macram- 
phidises; magnified 100; phot. Zeiss, apochr. 16, compens. oc. 6. 
3.— Section vertical to the surface through the superficial part of the sponge; magenta; magnified 30; 
phot. Zeiss, planar 20 mm.: 
a, outer surface with pinule-fur; b, group of flagellate chambers; c, wall of a canal. 
4.— Surface-view of a pore-sieve on the lower side of the sponge; magnified 20; phot. Zeiss, planar 
20 mm. 
5-9.— Parts of anchor-teeth of macramphidises; magnified 2000; u. v. phot. Zeiss, q. monochr. 1.7, 
q. oc. 10: 
5, a portion of the middle-part of a tooth; 
6, 7, the end-part of a tooth; 
6, focussed lower; 7, focussed higher; 
8, the end-part of a tooth; 
9, portion of the basal part of a tooth. 
10.— Part of the superficial pinule-fur, from a section vertical to the surface; magnified 100; phot. 
Zeiss, apochr. 16, compens. oc. 6. 
11.— Surface-view of a portion of the superficial pinule-fur on the lower side of the sponge; magnified 20; 
phot. Zeiss, planar 20 mm. : 
12.— A slender-shafted micramphidisc; magnified 2000; u. v. phot. Zeiss, q. monochr. 1.7, q. oc. 10. 
13.— A medium mesamphidise; magnified 2000; u. v. phot. Zeiss, q. monochr. 1.7, q. oc. 10. 
14, 15.— Apical views of the crosses formed by the lateral rays of the superficial pinules; magnified 300; 
phot. Zeiss, apochr. 8, compens. oc. 12. 
16—22.— Side-views of pinules; magnified 300; phot. Zeiss, apochr. 8, compens. oc. 12: 
16, 19, canalar pinules; 
17, 18, 20-22, superficial pinules. 
