PLATE 28. 
Hexactinella monticularis LenDENFELD. 
Figures 1-28. 
1—4.— Four scopules; magnified 300; phot. Zeiss, apochr. 4, compens. oc. 6. 
5-7.— The centres and end-rays of three scopules; magnified 2000; u. v. phot. Zeiss, q. monochr. 1.7, 
q. oe. 10. 
8, 9.— The centre of a scopule; magnified 2000; u. v. phot. Zeiss, q. monochr. 1.7, q. oc. 10: 
8, focussed higher; 9, focussed lower. 
10.— Part of an uncinate; magnified 2000; u. v. phot. Zeiss, q. monochr. 1.7, q. oc. 10. 
11, 12.— Parts of discohexasters; magnified 2000; u. v. phot. Zeiss, q. monochr. 1.7, q. oc. 10: 
11, the end of an end-ray of a small discohexaster seen obliquely from above; 
12, an entire end-ray of a large discohexaster. 
13, 14.— The centres and end-rays of two scopules; magnified 300; phot. Zeiss, apochr. 4, compens. oc. 6. 
15, 16.— Two large discohexasters; magnified 300; phot. Zeiss, apochr. 4, compens. oc. 6. 
17, 18.— Parts of long-spined hexactines; magnified 200; phot. Zeiss, apochr. 8, compens. oc. 6. 
19.— Apical view of a superficial pentactine; magnified 200; phot. Zeiss, apochr. 8, compens. oc. 6. 
20.— Part of a small discohexaster; magnified 2000; u. v. phot. Zeiss, q. monochr. 1.7, q. oc. 10. 
21.— Part of the superficial skeleton-net (pentactines soldered together); magnified 200; phot. Zeiss, - 
apochr. 8, compens. oc. 6. 
22.— Part of a beam of the skeleton-net with a spine; magnified 200; phot. Zeiss, apochr. 8, compens. 
oc. 6. 
23.— The skeleton-net of part of a specimen; magnified 3.5; phot. Zeiss, planar 100 mm. 7 
24.— Part of a transverse section through a superficial portion of the skeleton; magnified 20; phot. 
Zeiss, planar 20 mm.: 
a, internal skeleton-net; b, spines protruding towards the surface. 
25.— Group of discohexasters from a spicule-preparation; magnified 300; phot. Zeiss, apochr. 4, com- 
pens. oc. 6. 
26.— Portion of the inner, sectioned face of a skeleton-net cut longitudinally in half; magnified 6.6; 
phot. Zeiss, planar 50 mm. 
27.— Part of the superficial skeleton-net (pentactines soldered together); magnified 200; phot. Zeiss, 
apochr. 8, compens. oc. 6. 
28.— Surface-view of the skeleton-net of one of the monticular protuberances of the surface; magnified 
6.6; phot. Zeiss, planar 50 mm. 
