PLATE 78. 



Hyalonema (Prionema) agujanum lata Lendenfeld. 

 Figures 1-15. 



1, 2. — Parts of stalk-spicules; magnified 100; phot. Zeiss, apoehr. 16, corapens. oc. 6. 



3. — A diactine pinule; magnified 300; phot. Zeiss, apochr. 8, compens. oc. 12. 



4. — View of the specimen; natural size; phot. Zeiss, anastig. 480/412 mm. 

 5-7. — Microhexactines; magnified 200; phot. Zeiss, apochr. 4, compens. oc. 6. 



8. — A microhexactine; magnified 500; phot. Zeiss, H. I. apochr. 2, compens. oc. 6. 

 9-11. — Pentactine piuules; magnified 300; phot. Zeiss, apochr. 8t compens. oc. 12. 

 12-15. — Macramphidiscs; magnified 50; phot. Zeiss, achr. aa, compens, oc. 6. 



Hyalonema (Hyalonema) grandancora Lendenfeld. 

 Figm-es 16-45. 



16-19. — Macramphidiscs; magnified 50; phot. Zeiss, achr. aa, compens. oc. 6. 



20. — Transverse section through the upper part of a Paly thoa polyp attached to the stalk of the sponge; 



magnified 30; phot. Zeiss, planar 20 mm. 

 21-40. — Uniformly and densely spined acanthophores from the Palythoa polyps; attached to the stalk; 

 magnified 200; phot. Zeiss, apochi-. 8, compens. oc. 6. 

 (Each vertical pau' of views represents the same spicule; the upper views of the pairs, figs. 21, 23, 

 25, 27, 29, 31, 33, 35, 37, 39, are focussed high, the views beneath these, figs. 22, 24, 26, 28, 30, 32, 

 34, 36, 38, 40, are focussed low; thus 21 and 22 represent the same spicule, 23 and 24, and so on). 

 41-45. — Pmules; magnified 300; phot. Zeiss, apochr. 4, compens. oc. 6: 

 42, 43, gastral pinules; 

 41, 44, 45, dermal pinules. 



