142 CONJUGATED. 



6. ZYGNEMA BELLE Hass. 



Char. Filaments about a foot in length, with truncate extre- 

 mities ; of considerable though rather less diameter than those 

 of Z. nitidum, mucous, glossy, and of a deep and beautiful 

 green colour ; investing membrane of the cells very evident, 

 and transparent Cells in the young filaments scarcely so 

 long as broad, but their length exceeds their breadth in 

 those which have conjugated ; round the interior of the cells 

 five or six loose spiral tubes may be faintly discerned ; 

 these contain the reproductive globules which are large, and 

 distinct, with a dark central nucleus. Sporangia oval some- 

 times almost circular, and fiattened, lying in inflated cells, 

 the cavity of ivhich they do not fill. 



Hassall, in Annals of Nat. Hist. vol. x. p. 37. 



Hob. Essex, Hertfordshire, and in several places in Mid- 

 dlesex ; abundant : A. H. H. In the pond between 

 Ramslye Rocks and Broadwater Forest, and on Hcnfield 

 Common : Mr. Jenner. 



This well-marked species is readily distinguished from all 

 others by the size of its filaments, the sporangia almost cir- 

 cular, and the inflated form of the cells. There is not a more 

 distinct or attractive species in the genus. 



7. ZYGNEMA NEGLECTUM Hass. 

 Plate XXIII. Figs. 1, 2. 



Char. Filaments of less diameter than those of Z. nitidum. 

 Cells rather longer than broad. Spires distinct, serrated. 

 Granules large. Sporangia oval, in some specimens, occa- 

 sioning a slight inflation of the cells in which they are 

 lodged. 



Hassall, in Annals of Nat. Hist. vol. x. p. 37. 



Hob. Neighbourhood of Cheshunt and other places ; com- 

 mon : A. H H. Vicinity of Tunbridge Wells and in 

 Kent : Mr. Jenner. 



This species has doubtless usually been confounded with 



