DUBLIN UNIVERSITY ZOOLOGICAL AND BOTANICAL ASSOCIATION. 257 
reason to hope for, and which, had I been so fortunate as to obtain, would 
havq met with a grateful reception), I have thought it my duty to bring 
forward this communication. I can only hope that those whose experience 
enables them to form an opinion may agree with me as to the propriety 
of the genus Leptocystinema,—while I trust I have succeeded in con¬ 
veying my own views and meaning intelligibly, though I greatly fear 
that, in my anxiety to be exact, I may have been only tedious, and with 
a real wish to be succinct as possible, as well as comprehensive, I may, 
perhaps, occasionally be found to have drawn undue attention to com¬ 
paratively trivial circumstances—it is to be hoped, however, not at the 
expense of points of higher significance, or of greater importance. 
The following is the Supplemental Catalogue of Desmidiaeeae found 
near Dublin (for preceding one vide u Natural History Review,” Pro¬ 
ceedings of Societies, vol. iv., p. 36):— 
Didymoprium Grevillii ( Kiitz .), rather rare; though (like other filamen¬ 
tous species) when met with, sometimes plentiful. 
Leptocystinema Kinahani ( mihi) ( n . g.), very rare. 
[Hitherto met with but in a single pond on the Shank- 
hill road, about a mile beyond Ballinascorney 
Bridge.] 
,, asperum = Docidium asperum (. Brel .), not rare. 
,, Portii {mihi), not rare. 
Sphaerozosma vertebratum {Brel,), rare. 
,, pulchellum {mihi), very rare. 
Micrasterias Jenneri {Ralfs), rare. 
Euastrum cuneatum ( Jenner), rare. 
,, insigne {Hass.), not uncommon. 
Cosmarium Ralfsii {Brel.), not uncommon. 
,, tinctum {Ralfs), rare. 
Staurastrum O’Mearii {mihi), rare. 
,, brevispina {Brel.), rare. 
,, monticulosum {Brel.), rare. 
[Of this rare and pretty species, I have found a quad¬ 
rangular variety (PlateXL, Pig. 16, exhibits an end view), 
as well as the triangular form recorded in Ralfs. The 
former differs from the latter only in possessing an addi¬ 
tional side and angle, and in the gatherings in which it 
occurred the quadrangular variety was rather the more 
numerous; both are rare, however. I do not think there 
can be any doubt as to the form of which the end view is 
figured (Pig. 16), being the Staurastrum monticulosum 
{Brel.), yet as the drawing after M. de Brebisson in Ralfs 
appeared to me as not quite characteristic, especially as 
to the end view, at least as far as my plant was concerned, 
having the opportunity, I have thought it might be worth 
while to introduce a sketch. The diameter of end view is 
