122 DUBLIN UNIVERSITY 



contain it. Considering the note appended to the record of the occurrence 

 of Docidium asperum (Br&b.) in my former catalogue, it may appear un- 

 justifiable temerity on the part of an amateur to essay that, which I 

 there expressed a hope that the occasion might arrive when some of our 

 " master-hands" might see it advisable to accomplish. I had not at that 

 time met with Leptocystinema Kinahani — the impression then upon my 

 mind had grown into a conviction, so far as my own judgment on the 

 matter was concerned — and so (though unaided by the advice or opinion 

 of any fellow amateur making these organisms a study, but which I had 

 reason to hope for, and which, had I been so fortunate as to obtain, would 

 have 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 Desmidiaceaa found 

 near Dublin (for preceding one vide " Natural History Review," Pro- 

 ceedings of Societies, vol. iv., p. 36) : — 



Didymoprium Grevillii (JTiitz.), 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 (Brtb.), not rare. 



,, Portii (mihi), not rare. 



Sphserozosma vertebratum (Br6b.\ rare. 



„ pulchellum (mihi), very rare. 



Micrasterias Jenneri (Ralfs), rare. 

 Euastrum cuneatum (Jenner), rare. 



„ insigne (27iw*.), not uncommon. 



