i^V'-s^^" 





204 CYSTOSPERMEJS. 



This is certainly a very distinct species, and one moreover 

 by on means uncommon. 



20. Vesiculifera f ASCI ATA 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 

 circular, contained iJi cells of the same form, 



Vesicidiferafasciata Hassall, in Annals of Nat. Hist., vol. x. 

 p. 392. 



Hab. 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 spHiERiCA 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 j)receding 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 

 twice or thrice as long as broad. Sporangia contained in 

 cells of a compressed ellipsoidal form. 



