EXPLANATION OF THE PLATES. 13 



PLATE LIII. 



Fig. 1. Vesiculifera affinis. Fig. 2. Vesiculifera inequalis. 

 Fig. 3. Vesiculifera aqualis. Fig. 4. Vesiculifera 

 compressa. Fig. 5. Vesiculifera spherica. Fig. 6. Vesi- 

 culifera fasciata. Fig. 7. Vesiculifera Rothii. Fig. 8. 

 Vesiculifera alata. Fig. 9. Vesiculifera fiavescens. 

 Fig. 10. Vesiculifera Mulleri. Figs. 11, 12. Vesicu- 

 lifera hexagona. Fig. 13. Vesiculifera. Fig. 14. Vesi- 

 culifera dubia. 



PLATE LIV. 



Fig. 1. Bulbochcete setigera in its ordinary condition. Figs. 

 2, 3, and 4. States of the same. 



PLATE LV. 



Cladophora crispata. 



PLATE LVI. 



Fig. 1. Cladophora glomerata. The species not magnified. 

 Fig. 2. The same magnified. 



PLATE LVIL 



Cladophora glomerata var. agagropila. 



PLATE LVIII. 



Hydrodictyon utriculatum. 



PLATE LIX. 



Figs. 4, 5, 6. Lyngbya zonata in its ordinary form. Figs. 

 1, 2, 3. Lyngbya zonata var. Fig. 7. Lyngbya muralis. 



PLATE LX. 



Figs. 1, 2. Lyngbya fioccosa. Fig. 3. Lyngbya virescens. 

 Fig. 4. Lyngbya punctalis. Fig. 5. Lyngbya vermicularis. 



