PLATE 72. 



Hyalonema (Prionema) pinulifusum Lendenfeld. 

 Figures 1-15. 



1, 2. — A large mesamphidisc with serrated teeth; magnified 500; phot. Zeiss, apochr. 4, compens. oc. 6: 



1, focussed high (on the upper anchor-teeth) ; 2, focussed lower (on the axis of the shaft). 

 3-8. — Mesamphidiscs with smooth teeth, and parts of such; magnified 500; phot. Zeiss, apochr. 4, 

 compens. oc. 12: 



3, a large one; 



4, 5, the centrum and one anchor of two large ones; 

 6-S, small ones. 



9-15. — Micramphidiscs; magnified 500; phot. Zeiss, H. I. apochr. 2, compens. oc. 6: 

 9-14, small ones with long anchors; 

 15, a large one with short anchors. 



Hyalonema (Prionema) agujanum tenuis Lendenfeld. 



Figs. 16, 22, 26 —form B. 



Figs. 17-21, 23-25, 27 — form A. 



16-18. — Microhexactines; magnified 200; phot. Zeiss, apochr. 8, compens. oc. 6: 



16, of form B; 



17, 18, of form A. 



19. — A hypodermal pentactine of form A; magnified 50; phot. Zeiss, achr. aa, compens. oc. 6. 



20. — Part of an axial, longitudmal section of form A showing the gastral pinule-fur; magnified 100; 



phot. Zeiss, apochr. 16, compens. oc. 6. 

 21-25.— Pmules; magnified 300: 



21, 23-25, of form A; phot. Zeiss, apochr. 4, compens. oc. 6; 



22, of form B; phot. Zeiss, apochr. 8, compens. oc. 12. 



26, 27. — Hexactine megascleres; magnified 50; phot. Zeiss, achr. aa, compens. oc. 6: 



26, of form B; 



27, of form A. 



