PLATE 48. 



Hyalonema (Prionema) spinosum Lendenfeld. 

 Figures 1-31. 



1-10. — Acanthophores ; magnified 100; phot. Zeiss, apochr. 16, compens. oc. 6: 

 1-5, tetractines; 

 6, a triactine; 

 7-9, diactines; 



10, a monactine. 



11, 12. — Views of the two specimens; reduced 1: 0.9; phot. Zeiss, anastig. 480/412 mm.: 



11, side-view of the smaller specimen; 



12, the larger specimen seen from above. 



13. — Part of an axial section of the smaller specimen; magenta; magnified 10; phot. Zeiss, planar 50mm. 

 14-16. — The central part of the shaft of a large macramphidisc; magnified 2000; u. v. phot. Zeiss, q. 

 monochr. 1.7, q. oc. 10: 



14, focussed high; 15, focussed low; 16, focussed intermediate. 

 17-22. — Side-views of dermal pinules; magnified 300; phot. Zeiss, H. I. apochr. 2, compens. oc. 6: 



17-19, 21, 22, pentactine pinules; 



20, a hexactine pinule. 



23. — Part of the gastral pinule-fur in an axial section; magnified 100; phot. Zeiss, apochr. 16, compens. 



oc. 6. 



24, 25. — Gastral pinules; magnified 300; phot. Zeiss, apochr. 4, compens. oc. 6: 



24, apical view of the lateral rays of one; 



25, side-view of another. 



26, 27. — Part of the distal ray of a gastral pinule; magnified 2000; u. v. phot. Zeiss, q. monochr. 1.7, 

 q. oc. 10: 



26, focussed lower; 27, focussed higher. 



28-31. — Small micramphidiscs; magnified 2000; u. v. phot. Zeiss, q. monochr. 1.7, q. oc. 10: 



28, a larger one with slightly curved shaft; 



29, a smaller one with broad anchors; 



30, 31, a smaller one with narrow anchors; 



30, focussed higher; 31, focussed lower. 



