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 inm. (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 it to 

 the stump and photographed bodj' 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: 

 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 



(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 stiU lower (the distal part of the ray). 



13-19. — More or less centrotyle amphioxcs from the gastral region of specimen b; magnified 50; phot. 



Zeiss, apochr. 16, compens. oc. 4. 

 20. — Group of microhexactines from a spicule-prcparation 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. 



