410 PROCEEDINGS OF SOCIETIES. 
identity there could be no doubt, as both their specimens and 
those from Bray Head quite agreed in every detail with Lundell’s 
description and figure (l.c¢.). Mr. Archer, as to the latter species, 
must quite concur with Hr. Lundell in placing C. anceps in Cos- 
marium and not in Euastrum, and for the reasons given in that 
author’s work. 
April 22nd, 1875. 
Resting Spores of Volvox globator shown by Dark-ground Lilumina- 
tion.—Dr. J. Barker showed the yellow resting-spore of Volvoxr 
globator—the so-called “ Volvyox aureus ;” also a copious number 
of examples in the ordinary characteristic condition under his 
dark-ground illumination, by which they were charmingly seen, 
the coloration shining out brilliantly. 
Puccinia Malvacearwm, Corda, new to Ireland.—Mr. G. Pim 
showed examples of Puccinia Malvacearum, Corda, which had oc- 
curred on Hollyhocks in his garden and threatened their destrue- 
tion, this being the first record of this Hollyhock-pest in 
Ireland. The plants had been grown from seeds obtained from 
England; Mr. Pim, therefore, suggested the question, Can the 
germs of the Puccinia have been already in the seeds, as those of 
Cystopus are stated by de Bary to find their way into certain 
Crucitere through seeds? The present examples quite agreed 
with the figures given in ‘ Grevillea,’ Dec., 1874. 
Sections of Leaves of Pinus Pattoniana and P. Hookeriana, exhi- 
bited.— Dr. McNab showed sections of the leaves of Pinus (Tsuga) 
Pattoniana and P. Hookeriana, and pointed out, the characters 
by which these two species might be distinguished. 
Spicules of Rawsonia elegans, Wright, exhibited—Mr. W. M. 
A. Wright exhibited specimens of the spicules of Hawsonia 
elegans, Wright = Calicella elegans, Gray. 
Navicula Barkeriana, n.s., O'M., exhibited and described.—Rev. 
E. O’Meara drew attention to the details of a new Navicula 
found by him sparingly in two distinct localities, namely, Dalkey, 
Co. Dublin, and the Breeches, near Newcastle, Co. Wicklow. 
The valveis linear, elliptical, gradually attenuated towards the pro- 
duced ends ; striz fine, close, linear, distinctly radiate, intermediate, 
unstriate, space wide in the middle, extending nearly to the 
margin, median line terminating at the central nodule in elon- 
gated pear-like expansions. Length, 0052”; breadth, 0014”. This 
form might on casual inspection be confounded with Navicula 
latiuscula, Kuetz., but on closer examination will be found to 
differ in the following details of structure: the free intermediate 
space between the inner ends of the strie is much wider; the 
ends instead of being simple are, in this case, produced; the 
strie are much coarser and radiate. Besides, the form is marine, 
whilst Nav. latiuscula is incidental to freshwater. Mr. O’Meara 
proposed to designate the species Navicula Barkeriana. 
Structure of Spine of Strongylocentrotus armiger, A. Agass.— 
Mr. H. W. Mackintosh showed a section of the spine of Strongy- 
