PLATE 50. 
Hyalonema (Prionema) spinosum LENDENFELD. 
f/f 
Figures 1-5. 
1-5.— Anchor-teeth of large macramphidise; 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 uppermost two teeth of an anchor, nearly en face; 
4, an anchor-tooth en profile, focussed lower; 5, the same, focussed higher. 
Hyalonema (Phialonema) pateriferum Wison. 
Figures 6-15 — form E. 
6-8.— Ordinary pentactine pmules; 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.— Micramphidises; magnified 2000; u. v. phot. Zeiss, q. monochr. 1.7, q. oc. 10: 
11, a small micramphidise with short anchors; 
12, 13, a small micramphidise 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. 
