PLATE LXIII. 



Figures magnified 500 diameters. 



Fig. 1. NAVICTJLA ENTOMON, Ehrb. K. B., 28, f. 74; Schm. At., 13, f. 



43-46, 48, 49; Cast. Chal., 20, f. 10. 

 " 2. " POLYONCA, Breb. ; Lewis, N. and R. Sp., 2, 1. 7 ; V. 



H., A, f. 14. 

 Figs. 3-5. TKICERATIUM VARIABILE. Brightw. M. J., 1850, p. 275, 17, f. 18 ; 



T. M. S., 1860, p. 149, 7, f. 7. 



Fig. 6. TERPSINOE AMERICANA, Ralfs, Prit., p. 859; Grim., 1868, p. 23. 



" 7. SYSTEPHANIA (Stephanopyxis) RAEANA, Cast., p. 151-9, f. 11. 



Va. 



Figs. 8, (29). RHAPHONEIS ARCHERI, O'M. M. J., 18(17, p. 247, 7, f. 12. Prob- 

 ably only a valve of Cocroneis; C. Costata? 

 " 9, 10. CHAETOCEROS BACILI.ARIA, Ehrb., Sill. J., 1845, p. 328, 4. f. 18; 



M. J., 1856, 7, f. 1, 2. 

 " 11-13. SYNDENDRIUM DIADEMA, Ehrb. Mik., 35 A, IS, f. 13; M. J., 



1856, 7, f. 49-52; M. D., 43, f. 59. 



14-16. LIRADISCUS MiNUTrs, ( i rev., T. M. S., 1865, p. 47, 5, f. 6. 

 Fig. 17. RHABDONEMA ATLANTICUM, Kain and Schult/e, Bull. Tor. Bot. 



Club, March, 1SS9, p. 75, PL 89, f. 7, 7a. Artesian 

 well, Atlantic City, N. J. 



18. COCCONEIS BOREAT.IS, Ehrb. Mik., 37, 3, f. 2. Of dubious value. 

 " 19. RHOMBEA, Ehrb. Mik., 35 A, 7, f. 2. Cannot tell at 



this day what these two Figs. (18, 19), really are. 

 Figs. 20,21. MELOSIRA HOROI..OGIUM, Ralfs. Prit., p. 819, 5, f. c>2. 

 " 22-24. STEPHANODISCUS MINUTUS, Grim.; Sm. Sp. T., No. 5, =Cyclo- 



tella Oregonica, Ehrb. Mik., 37, 2, f. 3. 

 Fig. 25. RHAPHONEIS AFFINIS, Grun.; Rappahannoc Cliff. Ungarns., 



PI. 27, f. 2( if,. 

 " 26. PETROPOT.ITANA, Grun. ; Petersburg, Va. Un- 



-arns.,27, f. 268. 



" '11. DIMEREGRAMMA FOSSILE, Grun. ; Ungarns., 27, f. 265. Mtl. 

 " 28. RHAPHONEIS LINEARIS, Grun.; Ungarns., 27, f. 262. Notting- 

 ham, Md. 



" 29. ARCHERI, ri<l<' Fig. 8. 



Figs. 30, 31. CYCLOTELLA COMPTA, Kg., V. H., 92, f. 16-22. 



" 32,33. DENTICULA ANTILLARIA, Cleve.. 1878, p. 14, 4, f. 26. 

 Fig. 34. CYMBELLA STODDERI, Cleve. ; N. L. K. D., p. 5, 1, f. 5. H. L. 



S. says figure is too symmetrical, looks too much 

 like Navicula. Copy from Cleve. is the only one 

 at hand. 

 Figs. 35, 36. COCCONEIS AMBIGUA, Grun., 1868, p. 14, 1, f. 9; V. H., 30, f. 8-10. 



= C. Californica, Gr. 

 " 37. ELONGATA, Ehrb. Mik., 7, 38, f. 8; 14, f. 31; 8, 3, f. 



13, etc. = C. placentula, var. 



" 38. SYNDENDRIUM DIADEMA, Grev., vide Figs. 11-13. 

 " 39. RHAPHONEIS FUSCUS? Ehrb. 



