134 PROCEEDINGS OF SOCIETIES. 
central constriction or inflation, entire, ends simply truncate, 
or dilated and truncate (no evident gelatinous sheath). 
1.—Leptocystinema Kinahani, n. sp. 
Filaments attached, frequently breaking up into separate 
joimts, which are slender, extremely elongate, linear, cylin- 
drical, and smooth, their ends abruptly truncate; the junc- 
tion of the halves marked by a pale transverse interruption 
of the cell-contents; endochrome forming a compressed 
longitudinal band, its broader diameter extending the entire 
width of the jomt—the narrower not filling more than one 
third, and presenting an undulating outline—-at the extrem- 
ities of the joint more or less retracted from the end of the 
primordial utricle, leaving a clear space, in which are active 
granules; the endochrome also having immersed within it a 
single longitudinal central series of light-coloured, well- 
defined, globular, dense corpuscles, one of these bodies 
occupying the centre of the transverse pale space. 
Length of jomt varyimg from 33, to 34 of an inch 
(averaging about ;4,5 in.); diameter of joint +7155 in. 
It affords me much gratification to have it i my power to 
connect the name of my friend Dr. Kinahan with this 
species, while I feel it a privilege to be permitted to employ 
this slight tribute of regard, and very unworthy recognition, 
on my part, of many marks of consideration. 
2.—Leptocystinema asperum = Docidium asperum. Bréb. 
Filaments fragile ; jomts “ slender, cylindrical, rough with 
minute scattered granules ;” “ends dilated ;” endochrome 
disposed in an irregularly narrowed, somewhat undulatory, or 
sub-spiral manner, sometimes bifid at the extremities, (or 
“scattered” ?), and having immersed in it a single median 
series of globular corpuscles, and usually with a pale space 
at the centre. 
Length of joint, 3, to & of an inch; breadth, z3;;; 
breadth at end, 545. (These are the measurements given 
by Ralfs, “ British Desmidie,” p. 159, with which my own 
have agreed very closely.) 
3. —Leptocystinema Portii, n. sp. 
Filaments very fragile ; joints very slender, fusiform, very 
gradually tapermg to the ends, where they become dilated, 
giving to the apex a sub-capitate appearance, rough with 
minute scattered granules ; endochrome disposed in an irre- 
gularly contracted manner, having immersed in it a single 
