PLATE 52. 



Hyalonema (Phialonema) pateriferum Wilson. 



Figs. 1-14, 16, 21-29 — form D. 

 Figs. 15, 17-19 —form F. 



Fig. 20 —form C. 



1, 2. — Microhexactincs of form D; magnified 500; phot. Zeiss, apochr. 4, compens. oc. 12. 

 3-10. — Macramphidiscs of form D; magnified 500: 

 3-9, phot. Zeiss, apochr. 4, compens. oc. 12; 

 10, phot. Zeiss, apochr. 4, compens. oc. 6; 

 3, 4, 9, 10, large macramphidiscs; 

 5-8, small macramphidiscs. 

 11-14. — Ordinary pentactine pinnies of form D; magnified 300; phot. Zeiss, apochr. 4, compens. oc. 6. 



15. — A pentactine pinule with long distal ray of form F; magnified 300; phot. Zeiss, apochr. 4, compens. 



oc. 6. 



16. — A diactine pinule of form D; magnified 300; phot. Zeiss, apochr. 8, compens. oc. 12. 

 17-19. — Acanthophores of form F; magnified 100; phot. Zeiss, apochr. 16, compens. oc. 6: 



17, a diactine; 



18, a pentactine; 



19, a triactine. 



20. — View of the specimen of form C; natural size; phot. Zeiss, anastig. 480/412 ram. 



21. — View of the specimen of form D; reduced 1: 0.84; phot. Zeiss, anastig. 480/412 mm. 



22. 23. — Parts of radial sections through superficial portions of the marginal region of form D; magnified 



30; phot. Zeiss, planar 20 mm.: 



22, part of an unstained section; 



23, part of a section stained with magenta. 



24-29. — Micramphidiscs of form D; magnified 500; phot. Zeiss, apochr. 4, compens. oc. 12: 

 24-26, small micramphidiscs; 

 27-29, large micramphidiscs. 



