EXPLANATIONS AND REFERENCES, 

 PLATE LV. 



Figures magnified 250 diameters. 



PAGE. 



Figs. 1, 2. CLOSTERIUM DIAN^:, . . . . . .25 



" 3, 4. CLOSTERIUM TURGIDUM, .... 24 



Fig. 5-8. CLOSTERIUM STRIOLATUM. . . . . .24 



" 9. CLOSTERIUM DELPONTII, .... 25 



' 10. CLOSTERIUM DIDYMOTICUM, . . . . .25 



" 11. CLOSTERIUM SUBCOSTATUM, , 24 



" 12. CLOSTERIUM LUNULA, Var. striatuin, . . . ,24 



Figs. 13, 14. CLOSTERIUM ENSIS. . . ... 23 



" 15, 16. CLOSTERIUM PRELONGUM, . . . . - 24 



Fig. 17. CLOSTERIUM BREBISSONII, ..... 24 



" 18-20. CLOSTERIUM LANCEOLATUM, . . . . .24 



" 21. CLOSTERIUM JUNCIDUM Var. gracillima-loevissima. . 23 

 " 22. CLOSTERIUM PRONUM, ...... 25 



