PLATE CV. 



Figures magnified 500 diameters. 



Pig. 1. TRICERATIUM TRIDACTYLUM, Bright.; M. J., 1853, p. 248, 4, f. 3. 



Schiii. At., 87, f. 12. Fossil, Petersburg, Va. 

 " 2. SEMICIRCULARE, (Euodia Brightwellii), M. J., 



1853, p. 252, 4, f. 21. 

 Figs. 3, 4. " SEMICIRCULARE, Artesian well, Atlantic City. 



Bull. Tor. Bot. Club, March, 1889. 

 Fig. 5. ARCTICUM, var. Californica, Grun. forma tetra- 



gone. 

 " 6. MEMBRANACEUM, Bright.; M. J., 1853, p. 251, 4, 



f. 15. Virginia. 

 " 7. AMERICANUM, Ralfs. ; Schm. At., 76, f. 3, 28. 



Nottingham, Md. 

 " 8. ARCTICUM, Bright, var. Californicum, Grun.; 



Schm. At., 79, f. 5. 



Figs. 9, 10. HYDROSERA TRIQTJETRA, Wallich ; Schm. At., 78, f. 36, 37. 

 Fig. 11. according to Pritch. 



12. Slide, Santa Cruz, Cal. 



13. TRICERATIUM CALIFORNICUM, (Lithodesmium) V. H., 115, f. 9. 



14. UNDULATUM ( Lithodesmium). 



Figs. 15, 16. KAINII, Schultze, Artesian well, Atlantic City, 



N. J. Bull. Tor. Bot Club, March, 1889. 



Fig. 17. REGINA, Heib., Schm. At., 97, f. 3-5. Atlantic 



City, N. J., artesian well. 



18. OINNAMOMEUM, Grev. Nearly allied to Gesto- 



<liscus; with marginal spines, about 5 on a 

 side it would be Cestodisciis ; without the 

 spines it is Triceratium. Camp. Bay. V. H., 

 126, f. 1. 



Ki-s. 19,20,21. EUODIA JANSCHII, Grun.; Santa Monica. V. H., 127, f. 1-4. 



