PLATE LXXVII. 



Figures magnified 500 diameters. 



Fig.s. 1, 2. CRASPEDODISCUS ELKOAXS, Ehrb. Ber., 1844, p. 2(>6, f. 12; Sill. 



J.. April, 1845, p. 324, 4, f. 1; Schm. At., '<><>, 



f. I. Nottingham, Md. 

 Fig. 3. TRICERATIUM AMULYCEROS, Ebrb. Ber., M. J., 1853, p. 250, 4. f. 



14; Schm. At., 1, f. 25. Richmond, Va. 



4. SPINOSUM, Bail.; Ricd.; Schm. At., 87, f. 3. 



Figs. 5, 6. ACTINOPHYCHUS ixTKRrr NCTATUS, Shad., M. J., 1860, p. 94, fi. 



f. 17. Richmond, Va. 

 Fig. 7. ACTINOPTYCHUS RAEANUS, Challenger, 1887. 7, f. 4. Santa 



Monica. 

 " 8. EuroDisctTs RADIATUS, var. anti<ina, J. 1). Cox. Richmond. 



Va., Atlantic City, artesian well ; Bull. Tor. 



Bot. Club, March, iss<. 

 Figs. 9, 10. TRICERATIUM SPINOSUM, vars., Schm. At., 76, f. 7. Richmond, 



Va. 



