PLATE 43. 



Hyalonema (Hyalonema) agassizi Lendenfeld. 

 Figures 1-7 — form A, Station 4656. 



1. — The upper part of a .stalk-spicule ; reduced 1 : 0..5; phot. Zeiss, anastig. 480/412 mm.: 



a, the portion represented in fig. 2; b, the portion represented in fig. 5; c, the portion repre- 

 sented in figs. 6 and 7; d, the portion represented in figs. 3 and 4. 

 2-7. — Parts of the stallc-spicule represented in fig. 1; magnified 100; phot. Zeiss, apochr. 16, compens. 

 oc. 6: 



2, 1 cm. from the upper end (at a in fig. 1) focussed on the axial thread; 



3, 4, 41 cm. from the upper end (at d in fig. 1); 



3, focussed lower, on the axial thread; 4, focussed higher, on the upper surface; 



5, 20 cm. from the upper end (at b m fig. 1) focussed on the axial thread; 



6, 7, 29 cm. from the upper end (at c in fig. 1); 



6, focussed lower, on the axial thread; 7, focussed higher, on the upper surface. 



