ARCHER ON CYLINDROCYSTIS, ETC. 203 
Montagu* has described a species of acarus very similar 
to this, which he says is constantly found, together with the 
ova, in the cellular membrane of the Gannet Pelicanus 
Bassanus. It is named by Montagu Cellularia Bassani. 
OssERVATIONS on the GRNERA CyLinpRocystis (Meneghini), 
Mesoranium (Nag.), ard Spirorania (Bréb.) (= Pat- 
MOGL@A, Kiutz., pro maxima parte), mainly induced by a 
paper by Dr. J. Braxton Hicks, F.RS., F.0.S., on the 
Lower Forms of Alge.t+ By Wiitiam Arcuer.t 
In a paper which I had the honour to read before this 
Society, in the session preceding last, on the genus 
Palmoglea (Kiitz.),§ I took the opportunity to bring before 
your notice the Irish forms. of that genus, or rather those 
forms by which Kiitzing would have been referred to it, but 
which, as I then stated, and as I still apprehend, belong 
more naturally to several individually distinct but closely 
related genera. I gave at the same time what may be 
called, in some measure, an analysis of the genus Palmogloea 
(Kiitz.), with regard to at least the majority of the forms 
therein included by that algologist. 
Dr. Hicks does that communication the honour of a special 
paper, in which he expatiates at some length on the validity 
of the characters which may seem available for the classifica- 
tion of the “ unicellular” Algze, and in doing so he touches 
upon some of the points alluded to by me.|| This able 
observer has had large experience amongst those humble 
forms; and I have always perused his communications with 
all the attention to which they are so eminently entitled, 
and with all the interest they are always so well calculated 
to excite, as well as with all the gratification their richness 
in noyel information is sure to impart. 
The paper in which Dr. Hicks does my previous one the 
honour of a notice abounds with observations full of im- 
aa aig of the Wernerian Natural History Society,’ vol. i, 1808, 
. + Remarks on Mr. Archer’s Paper on Alge, in ‘Quarterly Journal of 
Microscopical Science,’ N. 8., Vol. XII, p. 253. 
~ Read before the Natural History Society of Dublin, May 5, 1865. 
§ * Proceedings of the Natural History Society of Dublin,’ vol. v, p. 12; 
also ‘Quarterly Journal of Microscopical Scieuce,’ N.8., Vol. IV, p. 109 
1864). 
I sistant Journal of Microscopical Science, N. S., Vol. XIT, p. 253 
