PLATE 66. 



Hyalonema (Hyalonema) placuna Lendenfeld 



Figs. 1, 2, 5 — form A. 

 Figs. 3, 4, — form B. 



1-5. — Maeramphidiscs and parts of same; magnified 500; phot. Zeiss, apochr. 4, compens. oc. 6; 



1, a terminal anchor of a macramphidisc of form A; focussed low (the shaft in focus); 



2, the same anchor; focussed high (the upper teeth in focus); 



3, a macramphidisc of form B; focussed low (the shaft in focus); 



4, the same macramphidisc; focussed high (the upper teeth in focus); 



5, a macramphidisc of form A. 



