PLATE 75. 
Hyalonema (Prionema) agujanum tenuis LeNDENFELD. 
Figs. 1-13, 15, 17, 19-27, 29-37 —form A. 
Figs. 14, 16, 18, 28 —form B. 
1, 2.— A small serrated mesamphidise of form A; magnified 500; phot. Zeiss, apochr. 4 
1, focussed higher (the uppermost teeth in focus); 2, focussed lower (the centre of the 
3-21.— Macramphidises; magnified 50; phot. Zeiss, achr. aa, compens. oc. 6: 
3-13, 15, 17, 19-21, of form A; i 
14, 16, 18, of form B. EA 
22, 23.— A small serrated mesamphidise of form A; magnified 500; phot. Zeiss, H. I. apoc 
pens. oc. 6: 
22, focussed higher (the uppermost teeth in focus); 23, focussed lower (the centre of 
focus). 
24-27.— Micramphidises of form A; magnified 500; phot. Zeiss, H. I. apochr. 2, compens. 
28-30.— Three specimens; natural size; phot. Zeiss, anastig. 480/412 mm.: 
28, form B; A 
29, 30, aoe A. 
31-34.— Two micramphidises of form A; magnified 2000; u. v. phot. Zeiss, q. monochr. 
31-33, a smaller one: 
31, focussed high; 32, focussed intermediate; 33, focussed low; 
34, a larger one. 
35-37.— An abnormal macramphidise of form A; magnified 500; phot. Zeiss, apochr. 4, compe 
35, focussed low; 36, focussed intermediate; 37, focussed high. 
