262 
PROCEEDING'S OF SOCIETIES. 
alluded to by that distinguished author in his most valuable paper, 
might possibly, to our local observers at least, possess some interest. 
Others may have met with the same plant, who, while abstaining from 
making them public, may have carried out further and far more conclu¬ 
sive observations; and if, by drawing attention to this plant, I should 
be the unworthy means of eliciting their information, I shall have done 
some good, and my object in coming forward will have been accom¬ 
plished. 
DESCRIPTION OF PLATE XXL 
Fig. 1. Represents a single detached joint of Leptocystinema Kinahani , 
-so of an inch in length, magnified 330 diameters, showing the 
broad view of the compressed band of endochrome, with its 
longitudinal median series of corpuscles, central interruption, 
and terminal clear spaces and granules. 
Fig. 2. A single detached joint of the same, of an inch in length, 
magnified 330 diameters, showing the narrow or side view of 
the compressed endochrome, and terminal granules as well as 
one or two wandering motile granules remote from the end. 
Fig. 3. A portion of a filament of the same, the joints in this case of 
an inch in length, magnified 200 diameters, showing at its 
upper portion the lateral view, at its middle the oblique or 
intermediate view, and at the lower end the front view of the 
endochrome. The green contents of the continuous joints are, 
however, in the same filament, usually disposed in the same 
plane. The second and third joints from the top (shorter than 
the others) illustrate the fact of recent self-division after the 
manner prevalent in the Desmidiaceae, as indicated by the 
(as yet) not fully grown new portions of endochrome and 
nascent halves, and the consequent still eccentric position of 
the pale interruption, which in both joints is as yet consi¬ 
derably nearer to the recently formed septum than when in its 
ultimate regular central situation in the joint. [Of course, it 
will not be assumed that the joints are always absolutely ma¬ 
thematically straight. Although usually straight, some are 
occasionally more or less curved, or even bent (the sides being, 
however, always parallel), and this, no doubt, owing to ex¬ 
ternal circumstances. I have drawn them not more curved 
than they not unfrequently have presented themselves. JDoci- 
dium Ehrenbergii, for instance, is described as straight; this 
is its usual state ; but specimens sometimes, occur bent almost 
at right angles, and others sometimes with one segment, in 
place of being of the usual narrow and elongate form, conside¬ 
rably inflated, or almost globose.] 
Fig. 4. Exhibits the pressed-out cell-contents of Leptocystinema Kina¬ 
hani , magnified 330 diameters, showing the gradually broken- 
