PLATE 20. 



Holascus edwardsii Lendenfeld. 

 Figures 1-20. 



1, 2. — Large choanosomal pentactines; magnified 2.3; phot. Zeiss, anastig. 167 mm. 



3. — Inner sm-face of the body-wall of a specimen cut in half longitudinally; reduced 1:6.5; phot. 



Zeiss, anastig. 480/412 mm. 



4. — View of a specimen (outer surface of the body-wall) ; reduced 1:6.5: phot. Zeiss, anastig. 480/412 



mm . 



5-10. — The distal end-part of anchoring spicules; magnified 600; phot. Zeiss, apochr. 4, compens. oc. 12: 



a (in figs. 5-8), axial cross. 

 11-15. — Different parts of one and the same anchoring spicule; magnified 200; phot. Zeiss, apochr. 8, 

 compens. oc. 6: 

 11, portion of the proximal smooth part; 

 12-14, successive portions of the spined distal part; 

 15, the distal end-part with its anchor. 

 16-20. — The distal end-part of anchoring spicules; magnified 200; phot. Zeiss, apochr. 8, compens. oc. 6. 



