PLATE XXV. 



Figures magnified 500 diameters. 



Fig. 1. NAVICULA MESOGONGYI^A. Kg.. K. B., p. 99, Prit., p. 895, a 



var. of X. nobilis, Abh., 1870. 2, 1, f. 16. 



' 2. INCOMPERTA, Lewis, W.. M.D.. p. 18, 2. f. 20. 



Oregon. White Mountain. 



" 3. DECURREXS, Ehrb. Mik., 11, f. 28, Schm. At., 45, 



f. 29, 30. 



4. SERIANS. var. apirulata. Breb.. K. B., 30, f. 23, 



Lewis, W.. M.D., 8, 2, f. 5. White Mountain. 



5. SERIAXS, var. cruciforme, Lewis. W., M.D., 8, 2, 



f. 5. White Mountain. 



6. niRHYxrurs. Khrb. Mik.. 35, A., 14. f. 3, K. B., 



28, f. 48, Rab., S. D.. 6. f. 48. 

 " 7. STAURONEIS APKTT.ATA, Orev., Cal.. p. 30, 4, f. 8, Prit., 913, 



striae very fine. Cal. 

 Figs. 8, 9. XAVKTLA BOECKTI, Hcili.. Cons., p. 85, Sin. Sp. T., No. 252. 



Fresh-water, X. J. 

 Fig. in. STAUBONEIFOEMIS, Lewis, W., M.D., 2, f. 9. Lake 



Michigan. 



" 11. STAURONEJS TNFLATA, K-., K. B.. p. H5. :;<i, f. 22. Rab., S. D. 



p. 48, 0, f. 15, Sm. Sp. T., No. 492. Fresh-water. 



12. STODDERII, Lewis, W., M.D.. p. 13, 2, 6, Proc. 



Al. X. Sc., Sin. Sp. T.. No. 502. Markings on 

 this form are stronger. White Mountain. 

 Figs. 13, 14, 15. NAVICULA (AIYTOIONEIS) Stauntonii, Grun., C. and M., Xo. 



304, from slide, H. L. S. 

 16, 17. XIT/SCHIA VIRC4ATA, Roper., M. J., 1858, |. 2:1, :'.. !'. (i, Sm. Sp. 



T.. Xo. : J ,75, J. R. M. S, ls.v.0. PI. 13. f. 13. 

 " 18, 19. SYNKHRA <T(,CT,ARI>I i, Breb., Cleve., 18SSO. p. 107. H, f. 119. Sm. 



Sp. T.. Xo. 558. Figures taken from slide. 



Fig. 20. GONOTHECIUM ROGERSII, Ehrb., Bail., Sill. J., Mar., 1844, p. 



301, Mir., 18, f. 92, 93, M. J., 1856, PI. 7, f. 

 43-46, Mic. Die., 42, f. 39. Marine. 

 " 21. TRK-KRATIUM ACULEATUM, Ehrb. Mik., 1856, p. 14. Fig. 



suggested by the description. Fossil. 

 " 22. SPINOSUM, Bril., Sill. J., Vol. XLV1, 1844, 



Schm. At., 87, f. 7. Fossil, Va. 

 Figs. 2: 1 ,, 24. 25. HEMIAULUS POLYMORPHUM, Gran., F. Jos., p. 14, 2, f. 42, 49. 



Marine. 



" 26,27. MASTOGLOIA KINSMANII. Lewis. W.. M.D., p. 17, 2, f. 15, 



White Mountain. Fresh-water. 



