PLATE 92. 



Hyalonema (Oonema) crassipinulum Lendenfeld. 

 ' Figm-es 1-23. 



1-7. — Superficial pinules; magnified 50; phot. Zeiss, apochr. 16, compens. oc. 2: 

 1-5, gastral pinules; 

 6, 7, dermal pinules. 



8. — Portion of the lower layer (without the pinules) of the gastral membrane; magnified 100; phot. 



Zeiss, apochr. 16, compens. oc. 6. 

 9-11. — Microhexactines ; magnified 200; phot. Zeiss, apochr. 8, compens. oc. 6. 



12-15. — Parts of microhexactines (13-15) and a whole one (12); magnified 500; phot. Zeiss, H. I. 



apochr. 2, compens. oc. 6. 

 16, 17. — Canalar pinules; magnified 300; phot. Zeiss, apochr. 8, compens. oc. 12: 



16, a pentactine one; 



17, a hexactine one. 



18-21. — Side-views of superficial pinules; magnified 300; phot. Zeiss, apochr. 8, compens. oc. 6: 



18, a dermal pinule; 

 19-21, gastral pinules. 



22, 23. — The basal part of a gastral superficial pinule with the distal ray broken off rather short, seen 

 from above; magnified 300; phot. Zeiss, apochr. 8, compens. oc. 12: 



22, focussed higher, an optical transverse section of the distal ray; 



23, focussed lower, the lateral rays. 



