96 
Rev. E. O’Meara showed examples of Amphiprora duplex , 
taken at Bray for the first time, after repeated searchings in the 
locality. 
Rev. E. O’Meara, on the part of the Rev. T. G. Stokes, men- 
tioned that the diatom recorded by the latter, in the Minutes of 
the Club, January, 1866, as Triceratium Robertsianum, should, on 
Greville’s own authority, have been recorded as Triceratium 
extuberans. 
Mr. Crowe exhibited a copious gathering, from the original 
Bray-head locality, of Sfephanosphoera pluvial is in fine condition 
and activity, showing that after all we had pilfered away from the 
very circumscribed little pool in which it occurred, there was still 
enough left for its perpetuation. 
Mr. Crowe also exhibited a section of limestone from Gascony. 
Dr. Moore showed specimens of a Stigeoclonium, probably S. 
tenue, which had overgrown and much choked the leaves of 
Ouvirandra fenestralis in the warm house in the Botanic Garden. 
This plant is very prone to become enveloped by various Confer- 
voids, and it had proved very difficult to grow it at all so as to 
show the well-known and very remarkable peculiarity of the leaves. 
Mr. Archer showed specimens, taken near Arklow, of the 
Coelastrum, brought forward by him at the Club meeting, July 
18th, 1867, which was gathered on that occasion in Wales, and 
called by him Coelastrum Cambricum. The present were the first 
found in Ireland. This form differs from C. cubicuin, in having 
one, not three external tubercles to the cells. Some of the pre- 
sent specimens showed young coenobia formed within the parent 
cells, and almost ready to make their exit, which is accomplished 
by the bursting of the inflated wall of the parent cell. In the 
same gathering occurred numerous specimens of Scenedesmus 
obtusus, also showing young coenobia within the old cells, and all 
sizes of young colonies, some escaped, others, as mentioned, still 
within the expanded parent cell— a state of things which, if it 
had been seen by those who regard that the colonies increase in 
number of cells by simple self-division of an original cell longitu- 
dinally, and form the well-known double rows by a further 
oblique division, would have controverted that view, the truth 
being, as shown by Nageli, and as the present specimens proved, 
the young ccenobium is formed by the simultaneous division of 
the whole contents of the parent cell into the characteristic 
arrangement proper to the individual form ; and the only ultimate 
change, until new self-division sets in, yet observed, being an in- 
crease in size of the constituent cells of the ccenobium. 
September 1 7th, 1868. 
Mr. Kirby showed silk from cocoons of Attacus Cynthia, or 
Eria silkworm, which he had succeeded in rearing in the open air, 
in the neighbourhood of Dublin, during the past year. 
Dr. Frazer showed hydrated silica with vegetations of crypto- 
