204 CYSTOSPERME^. 



This is certainly a very distinct species, and one moreover 

 by on means uncommon. 



20. Vesiculifera fasciata Hass. 

 Plate LIII. Fig. 6. 



Char. Filaments of diameter about equal to that of V. crispa. 

 Cells usually three times as long as broad. Sporangia 



circidar, contained in cells of the same form. 

 Vesiculifera fasciata Hassall, in Annals of Nat. Hist., vol. x. 



p. 392. 

 Hob. In a pond on Nazing Common, Essex : A. H. H. 



This species differs from the preceding only in the shape of 

 the seed-bearing cells, which in V. crispa are somewhat ovate, 

 while in V. fasciata they are quite circular. It is possible 

 therefore that it is but a variety of V. crispa. 



21. Vesiculifera sph^rica Hass. 

 Plate LIII. Fig. 5. 



Char. Filaments about equal to those of V. fasciata. Cells 



usually once and a half or twice as long as broad. 



Sporangia spherical, contained in enlarged cells of the 



same form. 



Vesiculifera sphcerica Hassall, in Annals of Nat. Hist., 



vol. X. p. 392. 

 Hab. Vicinity of Cheshunt : A. H. H. 



This species differs only from the preceding in having 

 much shorter cells. I believe it to be distinct, however. 



22. Vesiculifera compressa Hass. 



Plate LIII. Fig. 4. 



Char. Filaments about equal to those of V. fasciata. Cells 

 ticice or thrice as long as broad. Sporangia contained in 

 cells of a compressed ellipsoidal form. 



