PLATE 25. 
Holascella euonyx LENDENFELD. 
Figures 1-24. 
1.— The end of a ray of an onyehhexactine; magnified 2000; u. v. phot. Zeiss, q. monochr. 1.7, q. oc. 10. 
2, 3.— The end of a ray of a large discohexactine; magnified 2000; u. v. phot. Zeiss, q. monochr. 1.7, 
q. oc. 10: 
_& focussed higher; 3, focussed lower. 
4, 5— The end of a ray of a large discohexactine; magnified 2000; u. v. phot. Zeiss, q. signgoue! MEFs, 
q. oc. 10: 
4, focussed higher; 5, focussed lower. 
6.— The end of a ray of an onychhexactine; magnified 2000; u. v. phot. Zeiss, q. monochr. 1.7, q. oc. 10. 
7-9.— Onychhexactines and hemionychhexaster; magnified 300; phot. Zeiss, apochr. 4, compens. oc. 6: 
7, 9, onychhexactines; 8, a hemionychhexaster. 
10, 11.— Large discohexactines; magnified 300; phot. Zeiss, apochr. 4, compens. oc. 6. 
12.— Apical view of the terminal spine-verticil (end-disc) of the upstanding ray of the large discohexac- 
tine represented in fig. 11; magnified 300; phot. Zeiss, apochr. 4, compens. oc. 6. 
13.— Group of microscleres from a spicule-preparation; magnified 300; phot. Zeiss, apochr. 4, compens. 
oc) 6: 
a, small discohexasters; b, onychhexactine. 
14, 15.— Side-view of superficial hexactines; magnified 100; phot. Zeiss, apochr. 16, compens. oc. 6. 
16.— The central part of a large tetractine principal spicule; magnified 100; phot. Zeiss, apochr. 16, 
compens. oc. 6. 
17.— View of the specimen; reduced 1: 0.86; phot. Zeiss, Tessar 250 mm. 
18.— A tetractine comital spicule; magnified 100; phot. Zeiss, apochr. 16, compens. oc. 6. 
19, 20.— Two groups of comital and other medium-sized spicules; magnified 00; phot. Zeiss, apochr. 
16, compens. oc. 6. 
21, 22.— The distal part of the distal ray of a superficial hexactine; magnified 600: phot. Zeiss, H. I. 
apochr. 2, compens. oc. 6: 
21, focussed higher; 22, focussed lower. 
23, 24.— The distal part of the distal ray of a superficial hexactine;- magnified 600; phot. Zeiss, H. I. 
apochr. 2, compens. oc. 6: 
23, focussed higher; 24, focussed lower. 
Farrea occa scutella LENDENFELD. 
Figures 25-29. 
25-29.— Small hexactines, attached and free; magnified 200; phot. Zeiss, apochr. 8, compens. oc. 6; 
25, a hexactine attached to a stout beam of the main network; 
26, a free hexactine; 
27, 28, hexactines attached to slender beams; 
29, hexactine attached to a medium beam. 
