258 
PROCEEDINGS OF SOCIETIES. 
Tioth of an inch; extreme length of front view, s&oth of an 
inch.] 
Stanrastrnm gracile ( Ralfs ), rare. 
,, tetracerum {Kutz), rare. 
,, cyrtocerum ( Breb .), ,, 
,, aspernm ( Breb .), ,, 
,, enorme {Ralfs), very rare. 
,, spongiosum ( Breb .), very rare. 
„ acnleatnm {Meneghini), rare. 
,, spinosnm ( Breb .), common. 
,, vestitum {Ralfs), rare. 
Tetmemorus laevis {Kiitz), not rare. 
Penium interrnptnm {Breb), rare. 
,, Eerginii {mihi), very rare. 
[Sparingly, in a dyke above the Devil’s Glen, between the 
Waterfall and the high road; also in a pond on the “ Pipers- 
town road,” rather more than a mile beyond Ballinascorney 
chapel.] 
Closterinm Ehrenbergii {Menegh), not uncommon. 
,, monilifernm {Khr), ,, 
„ Jenneri {Ralfs), rare. 
,, intermedium {Ralfs), rare. 
,, angustatum {Kutz), not uncommon. 
,, lineatum {Khr), not uncommon. 
,, setaceum {Khr), not rare. 
,, acutum {Breb), not rare. 
,, juncidum (3 {Ralfs), rare. 
Spirotaenia obscura {Ralfs), rare. 
Pediastrum pertusum {Kutz), rare. 
Scenedesmus acutus {Meyer), not rare. 
NOTICE OF THE OCCURRENCE NEAR DUBLIN OF A UNICELLULAR ALGA, 
BELIEVED TO BE ALLIED TO THAT ALLUDED TO BY M. HOFMEISTER 
{“ ANN. NAT. HIST.,” THIRD SERIES, VOL. I., NO. 1, JANUARY, 1858), (l ON 
THE PROPAGATION OF THE DESMIDLZE AND DIATOME2E.” 
Appended to a Catalogue of Desmidiacese appears not an inappropriate 
place to record the occurrence in our district of a unicellular plant, 
which, but for one reason, I think there might not otherwise be much 
difficulty in concluding to be the same as that alluded to by M. Hofmeister 
in the paper to which I have before adverted, and which organism he 
seems inclined to refer, very doubtfully, to this family. The plant met 
with here consists of a rather large, perfectly spherical cell, containing 
abundant and large smoothly defined chlorophyll-granules (which appear 
often as if containing one within the other, shell within shell, to the 
number of two or three), a scattered layer of which appears to line the 
internal wall of the cell, while others are distributed within in scat¬ 
tered rows (sometimes almost as if in broken, interrupted planes) radi- 
