PLATE VI. 



Figures magnified 250 diameters. 



PAGE. 



Figs. 1, 2. QLOSTERIUM DIAN.*:, , . . . . . .47 



" 3, 4. CLOSTERIUM TCROIDUM, . . . . .43 



" 6-8. CLOSTERIUM STRIOLATUM, . . . . .44 



Fig. 9. CLOSTERIUM DELPONTII, . ... . .45 



" 10. ClX)8TERIDM DIDYMOTICUM, . . . . .41 



" 11. CLOSTERIUM suBCOSTATUM, .... 43 



" 12. CLOSTERIUM LUNULA. Var. striatum, . . . 42 



Figs. 13, 14. CLOSTERIUM ENSIS, ... . 40 



" 15, 16. CLOSTERIUM PRELONOUM, . . . . 43 



Fig. 17. CLOSTERITJM BRBBISSONH, (Addenda, p. 172), . . 24 



Figp. 18,20. CLOSTERIUM LANCEOLATUM, (also Plate IX, fig. 14), . . 40 



Fig. 21. CLOSTERIUM JUNCIDTTM, Var. gracillinia-locvissiin.-i. 39 



" 22. CLOSTERIUM PRONUM, .... .50 



