PLATE 50. 



Hyalonema (Prionema) spinosum Lendenfeld. 

 Figui-es 1-5. 



1-5. — Anchor-teeth of large macramphidisc ; magnified 2000; u. v. phot. Zeiss, q. monochr. 1.7, q. oc. 10 

 1, slightly oblique view of an anchor-tooth focussed high; 2, the same focussed lower; 



3, the ujiperinost two teeth of an anchor, nearly en face; 



4, an anchor-tooth en profile, focussed lower; 5, the same, focussed higher. 



Hyalonema (Phialonema) pateriferum Wilson. 

 Figures 6-15 — form E. 



6-8. — Ordinary pentactine pinules; magnified 300; phot. Zeiss, H.I. apochr. 2, compens. oc. 6. 

 9, 10. — Parts of microhexactines; magnified 2000; u. v. phot. Zeiss, q. monochr. 1.7, q. oc. 10: 



9, the central part of a microhexactine; 



10, the central part and one ray of a microhexactine. 



11-14. — Micramphidiscs; magnified 2000; u. v. phot. Zeiss, q. monochr. 1.7, q. oc. 10: 



11, a small micramphidisc with short anchors; 



12, 13, a small micramphidisc with longer anchors; 



12, focussed lower; 13, focussed higher; 

 14, a large micramphidisc. 

 15. — The central part of the shaft of a large macramphidisc; magnified 2000; u. v. phot. Zeiss, q 

 monochr. 1.7, q. oc. 10. 



