PLATE 72. 
Hyalonema (Prionema) pinulifusum LENDENFELD. 
4 
Figures 1-15. 
1, 2.— A large mesamphidise 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.— Mesamphidises 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; 
6-8, small ones. 
9-15.— Micramphidises; 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. oe. 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, longitudinal section of form A showing the gastral pinule-fur; magnified 100; 
phot. Zeiss, apochr. 16, compens. oe. 6. 
21-25.— Pinules; 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, 
