PLATE LXIX. 



Figures magnified 500 diameters. 



Figs. 1, 2. PODOSPHENIA BAiLEYi, Ed ward s ; Lewis, N. and R., p. 9, 2, 



f. S; Sm. Sp. T., No. 423. New Jersey shore 



(= Licmophora. Baleyi). 

 Fig. 3. PODOSIRA VARIEGATA, A. S. ; Schm. At., 140, f. 3. Santa 



Monica. 

 Figs. 4, 5. MACULATA, S. B. D., 49, f. 328; Sm. Sp. T., No. 420; 



O'M. I. D., 26, f. 5a. 

 " 6, 7. TRICERATIUM PENTCARINUS, Wallich ; M. J., 1858, \~2, f. 10-12. 



(Amphitetras ornata.) 

 Fig. 8. ACTINOCYCLUS TRiRADiATUf^ Roper, M. J., 1858, p. 23-3, f. 5. 



8a, areolation under higher power. 



9. ACTINISCUS SIRIUS, Ehrb. Mik., 33, 15, f. 9; T. M. S., i860, p. 



147, 7, f. 14. Carried along for years, proves 

 to be no diatom. 



10. STJRIRELLA RATRAYI, A. Schm. At., 23, f. 18-21. Vancouvers 



Island. 



11. STICTODBSMIS CRATICUL.A, Grev.; (Surirella craticula), H. L. S. 



Sp. T., No. 508. This is a sporangial sheath. 

 There is a variety of this form, perhaps dif- 

 ferent species ; also a marine form found at 

 New London. 

 " 12. TOXONIDIA GRKGORIANA, Donk ; T. M. S., 1858, p. 19, 3, f . 1 ; 



B. J. N. H., 1879; M. D., 42, f. 42. 



Figs. 13, 14. CAMPYLODISCUS COSTATUS, W. S., S. B. D., 6, f. 52; M. D., 12, 



f. 6. (C. Hibernicus.) 



