PLATE 24. 



Holascella ancorata Lendenfeld. 

 Figures 1-9. 



1, 2. — Parts of spiny hcxactines; magnified 200; phot. Zeiss, apochr. 8, compens. oc. 6. 



3. — Group of principal spicules; magnified 4; phot. Zeiss, planar 100 mm. 



4. — Two microscleres from a spicule-preparation ; magnified 200; phot. Zeiss, apochr. 8, compens. oc. 6: 



a, a mici'oonychhexactine; b, a floricome. 

 .5-7. — Parts of floricomcs; magnified 1000; phot. Zeiss, H. I. apochr. 2, compens. oc. 12: 



5, the end of a main-ray with its verticil of end-rays, all of which are broken off rather short, seen 

 from above; 



6, the central part (main-ray cross) ; 



7, the greater part of a whole floricome. 



8. — The central part of a tetractine principal spicule; magnified 300; u. v. phot. Zeiss, q. monochr. 6, 



q. oc. 5. 



9. — The central part of a triactine comital sijicule; magnified 200; phot. Zeiss, apochr. 8, compens. oc. 6. 



Holascella euonyx Lendenfeld. 

 Figures 10-17. 



10, 11. — The central part (main-rays) of two small discohexasters; magnified 2000; u. v. phot. Zeiss, q. 

 monochr. 1.7, q. oc. 10. 



12. — A small discohcxaster; magnified 600; phot. Zeiss, H. I. apochr. 2, compens. oc. 6. 



13, 14. — Group of microscleres from a spicule-preparation; magnified 600; phot. Zeiss, H. I. apochr. 2, 



compens. oc. 6: 

 13, focussed lower; 14, focussed higher; 



a, part of an onychhexactine ; b, small discohexaster. 

 15. — The greater part of a small discohexaster; magnified 2000; u. v. phot. Zeiss, q. monochr. 1.7, 

 q. oc. 10. 



10, 17. — Group of two small discohexasters from a spicule-preparation; magnified 600; phot. Zeiss, 

 H. I. apochr. 2, compens. oc. 6: 

 IG, focussed lower; 17, focussed higher. 



