PLATE 74. 
Hyalonema (Prionema) agujanum tenuis LenpENFELD. 
Figs. 1-5, 8 —form A. 
Figs. 6, 7,9 —form B. 
1, 2.— Two anchor-teeth of large serrated mesamphidises 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 mesamphidise of form A; magnified 500; phot. 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 mesamphidise of form A; magnified 500; phot. Zeiss, apochr. 4, compens. oc. 6. 
6, 7.— A large serrated mesamphidise 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. 
