PLATE 71. 



Hyalonema (Prionema) pinulifusum Lendenfeld. 

 Figures 1-11. 



1-3. — A microhexactine; magnified 500; phot. Zeiss. H. I. apochr. 2, compens. oc. 6: 



1, focussed high (on the tips of the three upwardly directed rays) ; 2, focussed intermediate (on the 

 centre of the spicule); 3, focussed low (on the tips of the three downwardly directed rays). 

 4. — Part of a microhexactine; magnified 500; phot. Zeiss, H. I. apochr. 2, compens. oc. 6. 

 5-8. — Macramphidiscs and parts of such; magnified 500; phot. Zeiss, apochr. 4, compens. oc. 6: 



5, a whole one; 



6, 7, the centrum and one anchor of two others; 

 8, a tooth seen nearly en face. 



9. — Group of microhexactines from a spicule-preparation ; magnified 200; phot. Zeiss, apochr. 8, 



compens. oc. 6. 



10. — A micropentactine; magnified 200; phot. Zeiss, apochr. 8, compens. oc. 6. 



11. — The tip of the distal ray of a large pinule; magnified 500; phot. Zeiss, apochr. 4, compens. oc. 6. 



