PLATE 53. 



Hyalonema (Hyalonema) polycaulum Lendenfeld. 

 Figures 1-17. 



1-3. — Parts of a macramphidisc; magnified 2000; u. v. phot. Zeiss, q. monochr. 1.7, q. oc. 10: 



1, part of a terminal anchor, with the shaft in focus; 



2, the central part of the shaft; 



3, part of a terminal anchor with the uppermost teeth in focus. 



4. — View of the specimen; natural size; phot. Zeiss, anastig. 480/412 mm. 



5, 6. — A large micramphidisc; magnified 2000; u. v. phot. Zeiss, q. monochr. 1.7, q. oc. 10: 



5, focussed higher; 6, focussed lower. 



7. — A small micramphidisc; magnified 2000; u. v. phot. Zeiss, q. monochr. 1.7, q. oc. 10. 



8. — A hexactine megasclere; magnified 50; phot. Zeiss, achr. aa., compens. oc. 6. 



9-12. — Parts of niicrohexactines; magnified 2000; u. v. phot. Zeiss, q. monochr. 1.7, q. oc. 10: 

 9, 10, the centrum and one ray of a smaller microhexactine; 



9, focussed higher; 10, focussed lower; 

 11, 12, the centrum and one ray of a larger microhexactine; 

 11, focussed higher; 12, focussed lower. 

 13. — Group of macramphidiscs; magnified 100; phot. Zeiss, apochr. 16, compens. oc. 6. 

 14-16. — Microhexactines; magnified 500; phot. Zeiss, apochr. 4, compens. oc. 12. 

 17. — A strongly bent rhabd from one of the hard superficial knobs; magnified 300; phot. Zeiss, apochr. 

 4, compens. oc. 6. 



