PLATE 74. 



Hyalonema (Prionema) agujanum tenuis Lendenfeld. 



Figs. 1-5, 8 — form A. 

 Figs. 6, 7, 9 — form B. 



1, 2. — Two anchor- teeth of large serrated mesamphidiscs of form A; magnified 500: 



1, phot. Zeiss, H. I. apochr. 2, compens. oc. 6; 



2, phot. Zeiss, apochr. 4, compens. oc. 12. 



3, 4. — A large serrated mesamphidisc of form A; magnified 500; pliot. Zeiss, apochr. 4, compens. oc. 6: 



3, focussed lower (the centre of the shaft in focus) ; 4, focussed higher (the uppermost teeth in focus). 



5. — A large serrated mesamphidisc of form A; magnified 500; phot. Zeiss, apochr. 4, compens. oc. 6. 



6, 7. — A large serrated mesamphidisc of form B; magnified 500; phot. Zeiss, apochr. 8, compens. oc. 12: 



6, focussed lower (the centre of the shaft in focus) ; 7, focussed higher (the uppermost teeth in focus). 

 8, 9. — The terminal anchors of two large serrated mesamphidiscs with the uppermost teeth in focus; 

 magnified 500: 



8, of form A; phot. Zeiss, H. I. apochr. 2, compens. oc. 6; 



9, of form B; phot. Zeiss, apochr. 8, compens. oc. 12. 



