PLATE 55. 



Hyalonema (Phialonema) brevancora Lendenfeld. 

 Figures 1-37. 



1. — View of the larger fragment; natural size; phot. Zeiss, anastig. 480/412 mm. 



2, 3. — Pentactine megascleres; magnified 100; phot. Zeiss, apochr. 16, compens. oc. 6. 



4. — All angularly bent diactine megasclere; magnified 100; phot. Zeiss, apochr. 16, compens. oc. 6. 



5. — The centrum of the shaft of a macramphidisc; magnified 2000; u. v. phot. Zeiss, q. monochr. 1.7, 



q. oc. 10. 



6. — One end of an abnormal rhabd; magnified 100; phot. Zeiss, apochr. 16, compens. ^c. 6. 

 7-12. — Micramphidiscs; magnified 500; phot. Zeiss, H. I. apochr. 2, compens. oc. 6: 



7-9, small micramphidiscs; 

 10-12, large micramphidiscs. 



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



14, 15. — Macramphidiscs; magnified 500; phot. Zeiss, apochr. 4, compens. oc. 6. 



16-18. — A terminal anchor of a macramphidisc; magnified 500; phot. Zeiss, H. I. apochr. 2, compens. 

 oc. 6: 



16, focussed high; 17, focussed intermediate; 18, focussed low. 

 19, 20. — Part of a distal ray (19) and a whole distal ray (20) of a pinule; magnified 2000; u. v. phot. 



Zeiss, q. monochr. 1.7, q. oc. 10. 

 21-30. — Side-views of pinules; magnified 300; phot. Zeiss, H. I. apochr. 2, compens. oc. 6: 



21-28, of pentactine pinules with long-spined distal ray; 



29, of a pentactine pinule with short-spined distal ray; 



30, of a hexactine pinule with long-spined distal ray. 



31. — A hexactine megasclere; magnified 100; phot. Zeiss, apochr. 16, compens. oc. 6. 



32, 33. — Apical views of the lateral rays of pentactine pinules; magnified 300; phot. Zeiss, H. I. apochr. 



2, compens. oc. 6. 



34, 35. — A whole microhexactine (34) and part of one (35); magnified 500; phot. Zeiss, H. I. apochr. 2, 

 compens. oc. 6. 



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



