PLATE 31. 
Eurete erectum Scuuuze. 
Figures 1-28. 
1.— Centres and end-rays of two gastral scopules with large-headed, strongly divergent end-rays; 
magnified 300; phot. Zeiss, apochr. 4, compens. oc. 6. 
2-5.— Side-views of dermal pinules; magnified 200; phot. Zeiss, apochr. 8, compens. oc. 6. 
6-9.— The distal ends of end-rays of two rather large-headed gastral scopules; magnified 1200; phot. 
Zeiss, H.1. 1/12, compens. oc. 12: 
6, an end-ray head focussed high; 
7, the head of the same end-ray focussed lower; 
8, the head of another end-ray focussed high; 
9, the head of the same end-ray focussed lower. 
10-12.— The centre and the end-rays of a gastral scopule with large-headed, fairly divergent end-rays; 
magnified 300; phot. Zeiss, apochr. 4, compens. oc. 6: 
10, focussed high; 11, focussed lower; 12, focussed still lower. 
13.— Part of a large uncinate; magnified 600; phot. Zeiss, apochr. 4, compens. oc. 12. 
14.— A small uncinate; magnified 200; phot. Zeiss, apochr. 8, compens. oc. 6. 
15.— Part of a discohexaster; magnified 600; phot. Zeiss, apochr. 4, compens. oc. 12. 
16.— Group of scopules from a spicule-preparation; magnified 100; phot. Zeiss, apochr. 16, compens. 
oc. 6: 
a, two gastral scopules with strongly divergent, large-headed end-rays; b, a dermal scopule 
with nearly parallel, terminally not thickened end-rays. 
17.— The centre and end-rays of a dermal scopule with fairly divergent, terminally only very slightly 
thickened end-rays; magnified 300; phot. Zeiss, apochr. 4, compens. oc. 6. 
18.— An end-ray of a discohexaster; magnified 2000; u. v. phot. Zeiss, q. monochr. 1.7, q. oc. 10. 
19.— The centre and end-rays of a dermal scopule with nearly parallel, terminally not thickened end- 
rays; magnified 300; phot. Zeiss, apochr. 4, compens. oc. 6. 
20.— A gastral scopule with fairly divergent, large-headed end-rays; magnified 100; phot. Zeiss, apochr. 
16, compens. oc. 6. 
21.— A discohexaster; magnified 600; phot. Zeiss, apochr. 4, compens. oc. 12. 
22.— Part of the gastral membrane with the crosses formed by the lateral rays of the gastral pinules and 
pinule-derivates in situ; magnified 30; phot. Zeiss, planar 20 mm. 
23.— Two gastral scopules with fairly divergent, large-headed end-rays; magnified 100; phot. Zeiss, 
apochr. 16, compens. oc. 6. 
24,— Transverse section through the gastral zone of the tube-wall; magnified 100; phot. Zeiss, apochr. 
16, compens. oe. 6: 
b, lateral rays of gastral pinules; f, skeleton-net; g, gastral spines of the skeleton-net; h, distal 
rays of the gastral pinules; i, gastral scopules. 
25-28.— Parts of gastral scopules; magnified 2000; u. v. phot. Zeiss, q. monochr. 1.7, q. oc. 10: 
25, basal part of an end-ray; 
26, distal part of an end-ray; 
27, 28, centres of two different scopules. 
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