PLATE 24. 
Holascella ancorata LenpENFELD. 
Figures 1-9. 
1, 2.— Parts of spiny hexactines; 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, apocd: 8, compens. oc. 6: 
a, a microonychhexactine; b, a floricome. 
5-7.— Parts of floricomes; 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 spicule; magnified 200; phot. Zeiss, apochr. 8, compens. oc. 6. 
Holascella euonyx LeENDENFELD. 
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 discohexaster; 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. 
16, 17— Group of two small discohexasters from a spicule-preparation; magnified 600; phot. Zeiss, 
H. I. apochr. 2, compens. oc. 6: 
16, focussed lower; 17, focussed higher. 
