292 Transactions.— Botany. | 
Cladophora, sp. n. (1), I found in gently flowing water, attached by a 
short stem to a piece of iron pipe. It is nearly spherical in shape, about 
tz" in diameter, tufted, green. Filaments bright green, alternately branched, 
articulations 14 to 2 times longer than broad, slightly constricted at the nodes. 
Branches of two kinds—chetophorous, of which the articulations are 2-3 
times longer than broad, filled with endochrome, ending in elongated 
bristly processes; and sporiferous with articulations constricted at the nodes, 
cells from 4 to 1} times as long as broad, terminal cells sometimes clubbed. 
Capsular fructification on some of the rami either terminal or shortly 
stipitate. Fig. 2. 
Cladophora, sp. n. (2). Filaments have a distinct gelatinous investment. 
Cells three times longer than broad. Here and there, mostly at attachment 
of rami, occur large hexagonal cells, very like the inflated cells of (Edogo- 
nium, containing a circular spore. Terminal cells elongated, tapering to 4 
rounded point. Antheridial cells broader than long, spores subglobose, 
compressed. Free zoospores I have seen only once, and failed to discover 
cilia. Fig. 38. 
ZYGNEMACER, j 
1. Spirogyra communis, H., xviii. 4 
9 quinina, H., xxviii 
2. Zygnema cruciata, H., xxviii. : 
This family is tolerably abundant in the locality. I have, I think, been 
able to discriminate all the species that have come under my observation, 
with one exception. In this specimen the band of endochrome commences 
at one end of the cell, and after making a spiral and a half reaches the 
further extremity of the cell, where it bends upon itself, and after another 
spiral and a half reaches the end from which it started ; here it bends 8 
second time, and finally terminates at the opposite end of the cell, forming 
altogether a series of figure-of-8 knots. Fig. 4. 
. 
cells either with or without communication with contiguous cells. In this 
‘ocess we have a close analogy with the 1 henomenon of self 
