296 PROCEEDINGS OF SOCIETIES. 



Body irregular in figure, without test or integument, possessing, 

 immersed in its substance, a number (often considerable) of sphe- 

 rical cells, each with nucleus, nucleolus, and special wall, their con- 

 tents increasing by self-fission ; pseudopodia slender, and more or 

 less ramified, and occasionally mutually incorporated. 



Cystophrys HaecJceliana (nov. sp.). Cells of a bluish tint and 

 granular appearance ; nucleus of a sharply bounded, clear, circular 

 outline, and the nucleolus a darkish dot within ; cell-wall of a 

 yellowish tint, apparent only when the contents have somewhat 

 receded. Pseudopodia often long, slender, hyaline ; branches 

 irregular, their changes of form very slow. Diameter of cells 

 about -tyVtt^^ of an inch 



l^th June, 1868. 



Dr. John Barker again showed the little parasite exhibited at 

 last meeting, in a seemingly more mature condition, in which the 

 cell-contents of the inflated upper portion had become balled 

 together into a spore-like, greenish body, suspended in the centre 

 of the balloon-shaped parasite by means of radiating, linear, pel- 

 lucid processes, reaching to the inner surface of the pellicular 

 covering ; the hyaline stipes and. outer investment had become 

 contracted and, so to say, withered-looking. 



Dr. Barker likewise showed another minute parasitic structure 

 inhabiting the interior of a number of specimens of Closterium 

 attenuatum. These, too, had greenish contents, and were of an 

 elongate form, rounded at ends and somewhat contracted at the 

 middle, and they lay in single or double, or even triple rows, 

 longitudinally disposed, and more or less evenly end to end, 

 though occasionally somewhat irregularly scattered. These had 

 been noticed some weeks ago, and remained up to the present 

 without any perceptible change. 



Mr. Archer showed a pretty and well-marked little Staurastrum, 

 seemingly very rare, and now noticed for the first time in Ireland 

 — Staurastrum arachne. 



Rev. E. O'Meara exhibited a new Navicula, remarkable for its 

 undulate outline ; of this, as of other novelties, he is preparing a 

 detailed description and figures. 



Dr. Traquair showed scales of Calamicthys. 



Mr. Archer recorded the occurrence of Micrasterias fimhriata 

 (Ealfs) from Gallery, a locality still closer to Dublin than that in 

 which it had been first met with by Dr. Barker. It was singular 

 that this fine species had so long escaped observation here, being 

 shown for the first time only the meeting before last by Dr. Barker, 

 and for the second time at last meeting by Mr. Crowe, and this 

 third instance was from a locality difterent from either of the other 

 two. The present specimens, Mr. Archer thought, were calcu- 

 lated to bear out his view as to the spines drawn attention to by 



