is 
PLATE 82. 
Hyalonema (Oonema) bianchoratum pinulina LeNDENFELD. 
Figs. 1-23  — specimen b. 
Figs. 24-34 — specimen a. 
1.—Side-view of specimen b; reduced 1: 0.72; phot. Zeiss, anastig. 480/412 mm. (The stalk is broken 
at its point of origin. It lay loose in the bottle with the sponge-body. It fitted well to a broken 
stump of a stalk in the latter, and in all probability belonged to the sponge-body. I fixed itto 
the stump and photographed body and stalk together). 
2-5.— Parts of microhexactines of specimen b; magnified 500; phot. Zeiss, H. I. apochr. 2, compens. 
oc. 6. 
6-9.— Two microhexactines of specimen b; magnified 500; phot. Zeiss, H. I. apochr. 2, compens. oc. 6: a 
6, microhexactine focussed lower (on the three lower rays); 7, focussed higher (on the three upper {- 
rays); 8, another microhexactine focussed lower (on the three lower rays); 9, focussed higher ry, 7 
(on the three upper rays). 
10-12.— Parts of the centrum and one ray of a microhexactine of specimen b; magnified 2000; u. v. 
phot. Zeiss, q. monochr. 1.7, q. oc. 10: 
10, focussed high (the centrum and basal part of the ray); 
11, focussed lower (the whole ray and the centrum); 
12, focussed still lower (the distal part of the ray). 
13-19.— More or less centrotyle amphioxes from the gastral region of specimen b; magnified 50; phot. 
Zeiss, apochr. 16, compens. oc. 4. 
20.— Group of microhexactines from a spicule-preparation of specimen b; magnified 200; phot. Zeiss, 
apochr. 8, compens. oc. 6. 
21-34.— Pinules; magnified 300; phot. Zeiss, apochr. 8, compens. oc. 12: 
21-30, 32-34, side-views; 
31, apical view of the lateral rays; 
21-23, of specimen b; 
24-34, of specimen a; 
21, 23-28, 34, basal dermal pinules; 
22, 31-33, ordinary dermal pinules; 
29, 30, gastral pinules. 
