PLATE 108. 



Hyalonema (Prionema) crassum Lendenfeld. 

 Figures 1-17. 



1-9. — Superficial pentactines; magnified 30; phot. Zeiss, planar 20 mm.: 



1, 3-5, 8, 9, hypodermal pentactines; 



2, 6, 7, hypogastral pentactines. 



10-13. — Hexactine megascleres; magnified 30; phot. Zeiss, planar 20 mm. 



14, 15. — Two smooth macramphidiscs ; magnified 500; phot. Zeiss, apochr. 8, compens. oc. 12. 



16, 17. — Parts of smooth macramphidiscs; magnified 500; phot. Zeiss, H. I. apochr. 2, compens. oc. 4 



16, an anchor, focussed high, on the tips of the uppermost teeth; 



17, a little more than half of a macramphidisc, focussed on the centre of the shaft. 



