llah. Cheshunt and vicinity: A. II. II. Rusthall Coni-
n io n ; between Sharp’s Bridge and Piltdown Common ;
Henfield: Mr. Jenner. T u rf 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
Avhat I shall describe as a variety of this species, but which
may possibly be distinct. I t is characterized as follows: —
var. a. — Filaments o f the same diameter as those o f the
species proper. Cells eight or ten times as long as broad,
and enlarged on the side which gives origin to the tubes
o f communication. Sporangia oval, long.
26. Zygnema tenuissimum Hass.
Plate X X X I I . Figs. 9, 10.
Char. Filaments more slender than those o f Z. inflatum.
Cells eight or nine times as long as hroad. Sporangia producing
a slight irfation o f the receiving cells.
Zygnema tenuissimum Hassall, in Annals of Nat. Hist,
v o l. X. p . 41.
Hah. Cheshunt : A. II. H. Belmonden, H aw k h u rst:
Mr. Jenner. Parkind : Major Martin.
This species bears a very close resemblance to the preceding,
from which it is chiefly distinguished by its smaller size.
Second Subgenus. — Filaments not conjugating.
* Cells not inverted.
a. Spires single.
27. Zygnema eosteatum Hass.
Plate X X X I I I . Fig. 1.
Char. Filaments o f somewhat larger diameter than those o f
Zygnema nitidum.. Cells from h a lf to once as long as
hroad, spires numerous, granules small. Sporangia
broadly oval, sometimes almost circular, lying ohliquelg
in the cells, ivhich are not inflated.
Z . rostratum Hassall, MSS.
Hab. Pond, near Hounslow : A. II. II.
A very fine species, the largest of all the non-conjugating
Zygnemata. I t is very rare, for I have only once encountered
it.
28. Zygnema W oods ii Hass.
Plate X X X I I I . Fig. 1.
Char. Filaments o f somewhat less diameter than those o f
Zygnema quininum. CeUs usually about h a lf or two-
thirds as long as broad. Sporangia oval, lying obliquely
in the cells, which are enlarged on that side from which
the tubes o f communication proceed.
Z. Woodsii Hassall, MSS.
Hab. Cheshunt and neighbourhood: A. II. II. Several
places in Sussex and K e n t : Mr. Jenner.
On looking over Dillwyn’s “ Synopsis of B ritish Conferva;,”
I was surprised to find under the head of Conferva spiralis
the following notice of the species ju st characterized: —
“ Since the Introduction was printed, a curious specimen
of this species has been gathered by Mr. Horne of Clapham,
and examined by Mr. Woods, who gives the following account
of it. ‘ The plant is a j)ale dirty green, nearly Avithout
gloss, about the size of C. spiralis; Avhen magnified the
length of the joints is seen to be about equal to their Avidth,
or a little more, and the spiral tube is in most parts nearly
obliterated; but the chief singularity of this plant is in the
connecting processes, Avhich are uniformly at the ends instead
of as usual in the middle of the joints, and each of Avhich
appears to unite Avith the process of the next joint of the
same filament. No indication of the conjugation of tAvo
filaments is to be observed; the dark globules appear only
when the two joints are thus connected, and the adjacent
one is invariably empty.’ ” — Synopsis, p. 60.