PLATE XXII. 



Figures magnified .">00 diameters. 



Fig. 1. BIDDULPHIA TUOMKYI, vur. Roper, T. M. 8., 1859, p. 8, 1, f. 1, '2, 



Prit., p. 848, 6. f. 10; V. H., 98, f. 23. Marine. 

 Figs. 2, 3, 4. PYXIDICULA GLOBATA. This tig. copied from Pritchard has no 



value; it is no diatom. 

 Fig. 5. BIBLARIUM (HYLOBIBLIUM), eccentricum, Ehrb. Mik.. 33, 12, f. 



31. Marine. 



" 6. iSTYOOHiHLirM) divisum, Ehrb. Mik., 33, 12, f. 30. 



" 7. SYMBOLOPHORA ACUTA. Ehrb. Mik., 33. f. 21, Mic. Dicty, 43, f. 



54. Of no value ; probably only a fragment 

 of a Trieeratium. 



Figs. 8, 9. GOMPHONEMA OREGONicuM, Ehrb. Mik., 37, 2, f. 12, 13, = G. 



Herculaneum, Ehrb. = a large var. of G. Capi- 

 tatuni. Ehrb. Fresh-water. 

 Fig. 10. XAVICULA TUSCULA, Ehrb. Mik., 6, 1, f. 13, a. b., V. H., 10, f. 



14. Fresh-water. 



11. SUBINFLATA, Grim., M. S. S., Cleve, Vega., p. 470, 



f. 50, var. of limosa, Grun., V. H., 12, f. 20. Fresh- 

 water. 

 " 12. UNDULATA, var. of limosa, Grim., V. H., 12, f. 22. 



Fresh-water. 

 " 13. GIBBERULA, var. limosa, Grun., V. H., 12, f. 19. 



Fresh-water. 

 " 14. SCHUMANNIANA, = (trochus .' Ehrb.) Grun., V. H., 



11, f. 21. Fresh-water. 

 Figs. 15, 16. TENELLA, Breb., Prit., p. 904, Schm. At., 47, f. 45, 46, 



= N. radiosa, var. Fresh-water. 



Fig. 17. NITZSCHIA CURSORIA, (Bacilaria Cursoria), Prit., 784, 4, f. 20, 



Grun., Cleve, 1880, p. 89; V. H., 62, f. 19. Fresh- 

 water. 



" 18. XAVICULA DEWITTIANA. K. and S., Bull. Tor. Bot. Club, Au- 

 gust, 1889, Atlantic City, N. J. Fossil. 



" 19. GOMPHONEMA CAPITATUM, Ehrb. Mik., 16, 3, f. 37; K. B., 16, 



f. 2; Rab. S. D., 8, f. 15; S. B. D., 28, f. 237. 

 Fresh-water. 



" 20. SCHIZONEMA VULGARE, Thwaites, A. X. H., 1848, 12, f. 41, V. 



H., 17, f. 6. Marine. 



21. XAVICULA RHOMBOIDES, Ehrb., K. B., 28, f. 45; 30, f. 44; Rab., 



S. D., 5, f. 15; S. B. D., 16, f. 129. Fresh-water. 



22. PLEUROSIGMA DKLICATULUM, W. S., S. B. D., 21, f. 302, Prit., 



p. 918; Sm. Sp. T., Xo.398. Fresh-water. 



Figs. 23,24. EPITHEMIA MARINA, Donk.,T. M. S., 1868, p. 29, 4. f. 14. 

 Fig. 25. AMPHORA PLICATA, = i A linoleata, Ehrb. ) Greg., T. M. S., 1857, 



p. 70, 1, f. 3; H. L. S., Lens, p. 75, Xo. 25, 2, f. 3; 

 Schm. At., 26, f. 50. 

 Figs. 26, 27. PODOSPHKNIA = (LiCMOPHORA), papeana, Grim., 1863, p. 138, 



14, f. 11, Fig. 27, var. elongata. 



Fig. 2*. COLLECTOR EMA VULGARE, Thwaites, A. N. H., 2d Ser., Vol. I, 



12, f. H., S. B. D., II, p. 70, 56, f. 35, Sm. Sp. 

 T. Fresh-water. 



" 29. BIDDULPHIA LUNATA, Ehrb. Mik., 18, f. 53. Very doubtfully 



a Biddulphia. 



