152 CONJUGATED. 



Hob. Chcshunt and vicinity : A. H. H. Rusthall Com- 

 mon ; between Sharp's Bridge and Piltdown Common ; 

 Henfield: Mr. Jenner. Turf Dyke, near Ardrossan: 

 Major Martin. 



I have now ascertained that the Zygnema varians described 

 by me in the " Annals of Nat. Hist." vol. xi. p. 431., is 

 the Conjugata inflata of Vaucher, a species which I have 

 been long anxious to identify. I have recently met with 

 what I shall describe as a variety of this species, but which 

 may possibly be distinct. It is characterized as follows : 



var. a. Filaments of the same diameter as those of the 

 species proper. Cells eight or ten times as long as broad, 

 and enlarged on the side which gives origin to the tubes 

 of communication. Sporangia oval, long. 



26. ZYGNEMA TENUISSIMUM Hass. 

 Plate XXXII. Figs. 9, 10. 



Char. Filaments more slender than those of Z. inflatum. 

 Cells eight or nine times as long as broad. Sporangia pro- 

 ducing a slight iiiflation of the receiving cells. 



Zygnema tenuissimum Hassall, in Annals of Nat. Hist, 

 vol. x. p. 41. 



Hab. Cheshunt : A. II. H. Belmonden, Hawkhurst : 

 Mr. Jenner. Parkind : Major Martin. 



This species bears a very close resemblance to the preced- 

 ing, from which it is chiefly distinguished by its smaller size. 



Second Subgenus. Filaments not conjugating. 

 * Cells not inverted. 

 a. Spires single. 



27. ZYGNEMA ROSTRATUM Hass. 

 Plate XXXIH. Fig. 1. 



Char. Filaments of somewhat larger diameter than those of 

 Zygnema nitidum. Cells from half to once as long as 



