. PLATE 73. 
Hyalonema (Prionema) agujanum tenuis LENDENFELD. 
Figs. 1-6 —form A. 
Fig. 7 —form B. 
1.— Front-view of the tip of a tooth of a macramphidise of form A; magnified 500; phot. Zeiss, H. I. 
apochr. 2, compens. oe. 6. 
2, 3.— Front-view of the tip of a tooth of a macramphidise of form A; magnified 2000; u. v. phot. Zeiss, 
q. monochr. 1.7, q. oc. 10: 
2, focussed lower; 3, focussed higher. 
4.— Half of a macramphidise of form A; magnified 500; phot. Zeiss, apochr. 4, compens. oc. 12. 
5-7.— Macramphidises; magnified 500: 
5, 6, of form A; 
7, of form B; 
5, phot. Zeiss, apochr. 8, compens. oc. 8; 
6, 7, phot. Zeiss, apochr. 4, compens. oc. 6. 
