DUBLIN UNIVERSITY ZOOLOGICAL AND BOTANICAL ASSOCIATION. 251 
pale transverse interruption of the cell-contents; endochrome forming 
a compressed longitudinal hand, its broader diameter extending the 
entire width of the joint,—the narrower not filling more than one-third, 
and presenting an undulating outline,—at the extremities 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 joint varying from 2&0 to do of an inch (averaging about 
tso in.) ; diameter of joint rdoo in. 
It affords me much gratification to have it in my power to connect 
the name of my friend Dr. Kinahan with this species, while I feel it a 
privilege to he 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 (. Breb .). 
Dilaments fragile; joints “ slender, cylindrical, rough with minute 
scattered granules;” “ ends dilated;” endochrome disposed, in an irregu¬ 
larly 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, 9 V to A? of an inch ; breadth, ; breadth at end, 
T 2 V 2 . (These are the measurements given by Balfs, “British Desmidiae,” 
p. 159, with which my own have agreed very closely.) 
3.— Leptocystinema Portii (nov. sp .). 
Dilaments very fragile; joints very slender, fusiform, very gradually 
tapering to the ends, where they become dilated, giving to the apex a 
sub-capitate appearance, rough with minute scattered granules; endo¬ 
chrome disposed in an irregularly contracted manner, having immersed 
in it a single median series of globular corpuscles, and usually with a 
pale space at the centre. 
Length of joint varying from 2^0 to tus inch; diameter at the middle 
of the joint, 3 - 500 ', just under the dilated extremity, sdws', and of the ex¬ 
tremity itself, TeVo in. 
Although the compliment may be but an unpretending one, it affords 
me great pleasure to have the opportunity of associating the name of my 
friend, George Porte, Esq., with this species,—a gentleman whose mani¬ 
pulative skill in its use is only equalled by his admiration of the many 
beautiful objects brought to view by the microscope,—while it will be 
commemorative, too, of the origination and initiation by him of a series 
of pleasant re-unions, at once scientific and social, on the part of a limited 
little circle, in the number of whom it is my own esteemed privilege to 
he counted a unit. 
