VESICULIFERA. 205 



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

 vol. x. p. 393. 



Hob. In a pond in Yorke's Brickfield, near Cheshunt : 

 A. H. H. 



The inflations in this species resemble in form the knobs 

 of dumb-bells. 



23. VESICULIFEKA IN^EQUALIS. 

 Plate LIII. Fig. 2. 



Char. Filaments in a state of reproduction of very unequal 

 diameter. Cells varying in length, being sometimes four 

 or Jive times as long as broad, at others only three times ; 

 these variations occurring usually on different parts of the 

 same filament. Sporangia circular, lodged in cells which 

 present an hexagonal appearance, empty cell next the spore 

 larger than the rest. 



Hob. Cheshunt : A. H. H. Rusthall Common and Bur- 

 wash : Mr. Jenner. 



This appears to me to be a very distinct species ; it is sub- 

 ject, however, to considerable variation. It, as well as the 

 following, is very common, and both were procured by Mr. 

 Jenner, Mr. Ralfs and myself within a very short time of 

 each other. 



24. VESICULIFERA ^EQUALIS Hass. 

 Plate LIII. Fig. 3. 



Char. Filaments of smaller calibre than those of the preced- 

 ing species, of equal diameter. Cells about six times as long 

 as broad. Sporangia circular, lodged in cells which are 

 broader than long. 



Hob. Cheshunt : A. H. H. Rusthall Common and Del- 

 monden ; Hawkhurst : Mr. Jenner. 



This as well as the preceding species is found in boggy 

 pools which retain the water for a long time. 



