44 
SCIENCE. 
Art. 35. Any member or fellow wbo shall pay the sum 
of fifty dollars to the Association, at any one time, shall be- 
come a Life Member, and as such shall be exempt from all 
further assessments, and shall be entitled to the Proceed- 
ings of the Association. All money thus received shall be 
invested as a permanent fund, the income of which shall be 
used only to assist in original research unless otherwise 
directed by unanimous vote of the Standing Committee. 
Art. 36. All admission fees and assessments must be 
paid to the Permanent Secretary, who shall give proper re- 
ceipts for the same. 
Art. 27. All members and fellows must forward to the 
Permanent Secretary, as early as possible, and when prac- 
ticable before the convening of the Association, full titles 
of all the papers which they propose to present during the 
meeting, with a statement of the time that each will occups 
in delivery, and also such abstracts of their contents as 
will give a general idea of their nature ; and no title shall 
be referred by the Standing Committee to the Sectional 
Committee until an abstract of the paper or the paper itself 
has been received. 
(Blank forms for giving the titles and abstracts of papers 
will be furnished by the Permanent Secretary on applica- 
tion. The Standing Committee particularly request, in 
order to facilitate the arrangement of the programme, that 
the titles and abstracts should be forwarded so as to reach 
the Permanent Secretary before August ninth. At the 
Saratoga meeting the Permanent Secretary was instructed 
not to enter , on the list of papers to be presented, any titles 
of papers until an abstract of the paper, or the paper itself, 
was received.) 
Notice of errors in the printed list of Members of the 
Association, of change of address, and information re- 
specting the decease of Members, should be sent to the 
Permanent Secretary in order that due notice may be 
taken of the same in the next volume of “ Proceedings.” 
It is particularly requested that the Permanent Secretary 
be notified at once of any errors in the names and ad- 
dresses that will be given in the list in the Saratoga 
volume, as a revised edition of the list will be printed 
for circulation at the Boston meeting. 
The Saratoga volume (vol. 28) will soon be distributed 
by mail to every member who has paid the assessment 
for the Saratoga meeting. 
The volumes of the Proceedings of the Association (28 
in number) can be obtained from the Permanent Secretary, 
at the price of $1.50 a volume ; or any member wishing 
for ten or more volumes, in order to complete a set, may 
obtain them at $1.00 a volume. The volumes may be had 
bound in cloth for the extra price of fifty cents each, or in 
one-half Turkey morocco for the extra price of $1.00 each. 
Uniform cloth covers for the volumes will be furnished by 
mail at thirty cents each, or by express or at the meetings 
for twenty-five cents each. Copies of Volumes 2 and 26 
will be received in exchange for other volumes or will be 
purchased at $1.00 each. 
The Memoir on Fossil Butterflies, by Mr. S. H. Scudder, 
published by the donation of Mrs. Elizabeth Thompson, 
4to, 1875, will be furnished at $2.00 a copy. The Transac- 
tions of the Association of Geologists and Naturalists, 1 
vol. 8vo, 1843, bound in cloth, can be obtained at $3.00 a 
copy. 
It will save much time and confusion at the meeting if 
members will send their assessments in advance to the 
Permanent Secretary, in return for which a Member’s 
ticket, bearing a receipt for the Boston meeting will be 
forwarded. Members not intending to be present at 
Boston, are particularly requested to send their assess- 
ment in advance, and to those who specially request the 
same a copy of the Boston Daily Programme will be 
mailed. 
The address of the Permanent Secretary, F. W. 
Putnam, Esq., will be Salem, Mass., until August 1st ; 
after that time, and until the meeting has adjourned, 
his office will be at the Massachusetts Institute of 
Technology, Boston, Mass. 
ON “ LIMNOCODIUM VICTORIA,” A HYDROID 
MEDUSA OF FRESH WATER. 
A short time since I received from Mr. Sowerby, Secre- 
tary of the Royal Botanical Society, a letter informing me of 
the occurrence of certain Medusoid organizations in the 
warm-water tank devoted to the cultivation of the Victoria 
regia in the Gardens of the Society. The letter contained a 
request that I should examine the animals with a view to 
their determination ; Mr. Sowerby accompanied it with rough 
sketches, and offered to place specimens at my disposal. 
The discovery of true freshwater Medusae was so startling 
a fact that I lost no time in calling on Mr. Sowerby, with 
whom I visited the tank, and carried away such specimens 
as were needed for examination. 
The water in the tank had then a temperature of 86° F., 
and was literally swarming with little Medusae, the largest 
of which measured nearly half an inch in transverse diame- 
ter. They were very energetic in their movements, swim- 
ming with the characteristic systole and diastole of their 
umbrella, and apparently in the very conditions which con- 
tribute most completely to their well being. 
As it now became evident that the Mtdusa belonged to a 
generic form hitherto undescribed, I prepared for the Lin- 
nean Society a paper containing the results of my examina- 
tion, and assigning to the new Medusa the name of Lim- 
nocodium victoiia (M/iwr/, a pond, and nwdtov, a bell). This 
was received and recorded by the secretaries on June 14, 
and read at the next meeting, on the 17th. 1 
The umbrella varies much in form with its state of con- 
traction, passing from a somewhat conical shape with de- 
pressed summit through figures more or less hemispherical 
to that of a shallow cup or even of a nearly flat disk. Its 
outer surface is covered by an epithelium composed of 
flattened hexagonal cells with distinct and bril- 
liant nucleus. The manubrium is large ; it commences 
with a quadrate base, and when extended projects beyond 
the margin of the umbrella. The mouth is destitute of ten- 
tacles, but is divided into four lips, which are everted and 
plicated. The endoderm of the manubrium is thrown into 
four stronglv-marked longitudinal plicated ridges. 
The radial canals are four in number , they originate each 
in an angle of the quadrate base of the manubrium, and 
open distally into a wide circular canal. Each radial canal 
is accompanied by longitudinal muscular fibres, which 
spread out on each side at the junction of the radial with the 
circular canal. 
The velum is of moderate width, and the extreme margin 
of the umbrella is thickened and festooned, and loaded 
with brownish-yellow pigment cells. 
The attachment of the tentacles is peculiar. Instead of 
being free continuations of the umbrella margin, they are 
given off from the outer surface of the umbrella at points a 
little above the margin. From each of these points, how- 
ever, a ridge may be traced centrifugally as far as the thick- 
ened umbrella margin ; this is caused by the proximate 
portion of the tentacle being here adnate to the outer surface 
of the umbrella. It holds exactly the position of the 
“ mantelspangen” or peronia, so well developed in the whole 
of the Narcomedusae of Haeckel, and occurring also in some 
genera of his Trachomedusae Its structure, however, 
differs from that of the true peronia, which are merely lines 
of thread cells marking the path travelled over by the ten- 
tacle as the insertion of this moved in the course of meta- 
morphosis from the margin of the umbrella to a point at 
1 Some facts in addition to those contained in my original paper are 
included in the present communication. 
