PLATE XLVIII. 



Figures magnified 500 diameters. 



Figs. 1-4. ODONTIDIUM MESODON, K. B., 17, f. 1; S. B. D., 34, f. 2SS, Sm. 



Sp. T., Xo. 3S2. 



" 5,1). IIYEMALE, K. B., 17, (. 4; 8. B. D., 34, f. 2; 



Sm. Sp. T., No. 381. 



" 7-12. MUTABILE. S. B. D., 34. f. 2!io : Sin. Sp. T., Nos. 



383, iil'2. 



" 13, 14. TESSEI.A (Mrititcria) INTERRUPTA, Ehrb.; K. B., 18, f. 4. M. 



D,. 14, f. 35- Sm. Sp. T., No. r>m. 



" 15-2U. ODONTIDIUM TABELLARIA, S. B. D., :',4, f. 201 ; Lewis, W., 



M. D., p. 13, 2, f. 1, 2. These figures repre- 

 sent abnormal or sporangial forms collected 

 by Dr. Lewis in White Mountain pools. 



Fig. 21. AMPHIPRORA ORNATA, Bail. M. O., p. 38, 2, f. 15, 23; V. H., 



22 bis f. 5. Compare plate, Figs. Bail.'s 

 figure, but too small. 



" 22-24. CAI/UMETICA, List of diatoms of Lake Michi- 



gan, B. W. Thomas, Chicago. 



" 25-2s. DICTYOCHYA forms frequently found in diatomaceous ma- 

 terial ; no longer accepted as diatoms. 



" 29-31. AMPHICAMPA many similar siliceous forms found, but can- 

 not be classed with diatoms. 



Figs. 32, 33. CLIMACOSPHAENIA ELONUATA Bail. N. Sp., p. S, f. 10, 11 ; 



Prit., p. 772. 



