PLATE XXVI. 



Figures magnified 500 diameters. 



Fig. 1-4, also Id, 1 1. GOMPHONEMA GEMiNATUM, S. and F. views, Ag., Syst., 



K. B., p. 8ft; 13, f. 2, Rab., S. D., 8, f. 14, 8. B. 

 D., 27, f. 235, Sm. Sp. T., No. 150. Variable 

 in size and form. Fig. 2, var. hybrida. 

 " 5. GOMPHONEMA MAMMILLA, Ehrb. Mik., 27, 2, f. 10, Abh., 1870, 



p. oft, V. H., 23, f. 1. 



Figs. 6, 7. CAPITATUM, vars. 



" 8, 9. MAXIMUM, Grun., not separable from G. mam- 



milla, Ehrb., V. H., 23, f. 3. Compare Fig. f>. 



Ill, 11. GEMINATUM, Ag., rill.C FigS. 1-4. 



" 12, 1."-. CONSTRICTUM, Ehrb., K. B., 13, f. 1, 2, Rab., S. 



D., 8, f. 12; S. B. D., I, p. 78, 28. f. 236, Prit., 

 p. 887, 10, f. 187-190. 

 14, 15. '^ CONSTRICTUM, in vegetative condition under 



lower power. 

 Fig. 1ft. DICHOTOMUM, Kg., K. B., 85, s, f. 14, S. B. D., 28, 



f. 240, Sm. Sp. T., No. 179. 



" 17. DICHOTOMUM, under lower power, in vegetative 



state. 



