392 Mr. HassalFs Notices of British Freshwater Conferva. 



It is certainly not the Conferva dissiliens either of Dillwyn's 

 work or of s English Botany'; that of the latter work being 

 probably identical with Desmidium mucosum. 



Vesiculifera ovata. Filaments of less diameter than those of 



V. paludina ; cells three or four times as long as broad ; 



spores at first ovate, but subsequently becoming circular, 



contained in inflated cells of an ovate form. 



I do not see that this species can be confounded with any 

 of the others. I have met with it but in one locality, viz. in a 

 small pond near the New River Reservoir, which is entirely 

 filled by it. 



Vesiculifera concatenata. Filaments about the thickness of 

 those of Vesiculifera ovalis ; cells six times as long as broad ; 

 spores oval, contained in much enlarged cells of a beaded 

 form, from three to six of which occur contiguously to each 

 other. 

 The inflated cells in this species appear very large compared 



with the size of the filaments, and are never, so far as I have 



observed, solitary, three being generally placed together, but 



not unfrequently as many as six. 



Cheshunt Common, and in a pond near Highgate. 



Vesiculifera aurea. Filaments of nearly the same diameter as 

 those of Vesiculifera ovalis ; cells from four to seven times 

 as long as broad ; spores oval, frequently of a golden colour, 

 usually solitary, but sometimes binary. When there is but 

 one spore an inflated empty cell is always placed next to it ; 

 and when there are two, these lie in adjacent cells, with an 

 enlarged cell not containing a spore next to one or other 

 of them ; not unfrequently six or seven contiguous cells are 

 inflated, which gradually taper from the first to the last. 

 This species has occurred abundantly to me in a pond at 

 Wood Green near Bury Green, vicinity of Cheshunt ; it ap- 

 pears to be very distinct from any of the others. In the con- 

 dition in which I met with it, viz. in seed, the filaments were 

 of a bright russet colour and the seeds golden. 



Vesiculifera fasciata. Filaments of less diameter than those 



of Vesiculifera virescens ; cells about three times as long as 



broad ; spores circular, contained in cells of the same form. 



This species approaches more closely than any of the others 



to Vesiculifera virescens, from which it differs principally in 



being altogether smaller. I do not know whether the cells are 



fasciated in all stages of their growth, but 1 should imagine 



not. 



In a pond on Nazing Common, Essex. 



