PROCEEDINGS OF SOCIETIES. 
MicroscopicaL Society. 
December 13th, 1865. 
James GuarsHER, Esq., F.R.S., President, in the Chair. 
Tur PresIpENT read the 7th Rule of the Society, with respect 
to the retirement and election of certain members of the Council 
and other officers, and announced that the Council recommended 
to fill the office of President for the ensuing year, himself; as 
Treasurer, C. J. H. Allen, Esq.; and as Secretaries, G. E. Blenkins 
and F. C. S. Roper, Esqrs.; and that H. A. Freestone, R. Mes- 
tayer, Hsqrs., Dr. Millar, and Samuel Charles Whitbread, Esq., 
should be elected members of the Council, in the place of Dr. 
Beale, H. Deane, Esq., R. Hodgson, Esq., and J. Newton Tomkins, 
Esq., who retired in accordance with the Bye-laws of the Society; 
and that the names of the gentlemen recommended would be 
suspended in the usual way. 
Mr. Beck read a paper entitled “ A Short Description of a 
New Species of Acarus, and its agamic reproduction.” (‘ Trans..,’ 
. 80.) 
E Mr. Stack.—With reference to this interesting subject, I may 
mention a report, in the ‘ Archives des Sciences’ for October, of 
some remarks made by Dr. Claparéde at a meeting of the Société 
Helvétique des Sciences Naturelles. Dr. Claparede said that 
several of these acari were bimorphic; that is to say, the male and 
female present very different appearances as regards form and size. 
He said that the so-called genus Hypopus (I believe, a kind of 
acarus without mouth or digestive apparatus) were the males of 
a species in which the females were much larger and very different 
in aspect. His remarks are somewhat imperfectly given, but I 
gather from them that in these cases of dimorphism the male 
acari are so different from the female as to justify the apprehen- 
sion that they belong to a totally different species. I find the 
Hypopus described in the ‘ Microscopical Dictionary’ as without 
