152 CONJUGATED. 



Hab. Chesliunt and vicinity : A. II. 11. 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." voh 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 diavieter as those of the 

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

 and enlarged on the side tchich 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. injlatum. 

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

 ducing a slight inflation of the receiving cells. 



■ Zygnema tenuissimum Hassall, in Annals of Nat. Hist, 

 vol. X. p. 41. 

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

 3Ir. 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 ?iot ijiverted. 



a. Spires si7igle. 



27. Zygnema rostratum Hass. 



Plate XXXIII. Fig. 1. 



Char. Filaments of someichat larger diameter than those of 

 Zygnema nitidum. Cells from half to once as long as 



