211 
Rey. E. O’Meara exhibited a new Mastogloia from the Sey- 
chelles material, of which, under the name of Mastogloia binor- 
nata, he would presently prepare a description. 
Mr. Archer had to offer to examination of the Club one more 
of such nondescript objects as he had occasionally brought for- 
ward—almost, he was sorry to say, meaningless in their obscu- 
rity—yet, perhaps, interesting to a certain extent from their very 
uncertainty. There was the more excuse for exhibiting the present 
production as it formed rather a pretty little object. From the 
colour and general appearance of the contents it might be con- 
jectured that the present was a “resting” state of some Peridinium ; 
but if so, and of which, was a puzzle. This formed an angular 
body, of a cubical, pentagonal, or hexagonal figure (or shaped 
like a “ concertina case’), each outer angle produced into a thick- 
ened, more or less numerously knobbed, pellucid projection; a 
similar projection occurred some half-way down each corner, and a 
single long, smooth, hooked, bluntly pointed, hyaline, nose-like 
projection from the middle of one only of the plane surfaces; 
the entire wall very thick and colourless, the contents coarsely 
granular, of a kind of olivaceous green, and carrying immersed in 
the centre a large brilliant red globule or clusters of bright, very 
red granules ; these always conspicuous through the dense re- 
mainder of the contents. The general appearance of the con- 
tents and the thick wall thus much resembled the undoubted 
resting-stages of some forms of Peridinium, but the singular ex- 
ternal figure rendered the present a much more remarkable 
object ; this curious outline could be best seen in an empty cell- 
wall, examples of which were now and again found in the gather- 
ings. With such a crude and bald account of this odd-looking 
object, Mr. Archer would be obliged to content himself; may it 
turn up again some time hereafter and reveal more tangible data. 
Mr. Archer had brought down for exhibition, but time did not 
admit of their being presented, examples of the desmid Pleuro- 
tenium cosmarioides (de Bary, ‘ Untersuchungen iiber die Familie 
der Conjugaten,’ t. v, f. 32, 33) = Cosmarium De Baryi, Prit- 
chard’s ‘ Infusoria.’ Thisspecies Mr. Archer had only once before 
met with, and on that occasion he had omitted to exhibit or record 
it. The present example showed a beautifully dotted appearance 
of the cell-wall, readily seen on the rim-like outline (adding to 
the pretty appearance of the form), which is not shown in de 
Bary’s figure ; but as he refers in the text to the occasional oc- 
currence of this character, there could hardly be any further doubt 
as to the identity of the present with de Bary’s form. Touching 
the value of the characters derivable from the arrangement of the 
endochrome in a generic or a specific point of view, as Mr. Archer 
had ere now expatiated thereon, there would be no further occa- 
sion to enlarge upon the question here (‘ Quart. Journ. Micr. 
Science,’ vol. ix, n. s., pp. 194, 5); of one thing, however, there 
was no doubt—there could be no more constant character in these 
forms than the mode of arrangement of the endochrome, that is 
