I>LATI-; LIV. 



Figures magnified 500 diameters. 



r\c.i-. 



V\g. 1. STAURASTRUM CYRTOCERUM, Var. major, end view, . 142 



" 2. " " Var. major, front view, . 142 



Fitfs. 3-5. STAURASTRUM MACROCERUM, three views, . . . 14S- 



" 6, 7. STAURASTRUM CERASTES, front and end views, . 147 



" 8, 9. STAURASTRUM ODONTOUUM, front and end views, . . 148 



" 10, 11. STAURASTRUM OPHIURA, front and end views, . . 147 



" 12, 13, 14. STAURASTRUM CORONULATUM, Var. Floridensf, . .149 



Fig. 15. STAURASTRUM PENTACLADUM, front and end views, . 149 



Figs. 16, 17. STAURASTRUM GRACILE, front and end views. . . 147 



