114 
PROCEEDINGS OP THE ACADEMY OF 
Authority was given to the Committee in charge of Say's Conchology 
to sell copies of impressions of the plates of that work. 
May I8th. 
Vice President Bridges in the Chair. 
Forty-live members present. 
^'^1 _ Mr. Lea exhibited some remarkable specimens of Unionidje, six to eight 
inches wide. Some of these had the soft parts, and he called attention to two 
fine specimens of Margaritana complanata, and Unio muUiplicatuSy both females, 
with the oviducts fully charged with embryonic shells, ready to be discharged 
by the parents. There were two important points he wished to be noticed.. 1st. 
The enormous quantity of young in the mass of the outer branchise of the 
Margaritana^ (the branchiae were 3 x H X ^- inches,) each specimen containing 
probably several millions of individuals. 2nd. That the Unio mulliplicatus was 
peculiar in having both lobes on both sides, charged with embryonic shells, con- 
taining no doubt several millions of individuals. This species of Unio is the 
only one Mr. Lea had ever observed furnished with oviducts in all the four leaver 
of the branchiae. It is very probable that half a dozen of these Mollusca would 
produce individuals equal in nnmber to the population of the whole United 
States. 
Mr. Cassin announced the death of Dr. Robert Hare, late a member 
of the Academy. 
May 2b th. 
Vice President Bridges in the Chair. 
Twenty-six members present. 
The Proceedings of the Biological Department for the current month 
were presented. 
The following papers were ordered to be published in the Proceed- 
ings : 
Note 3 on American Land Shells. No. 3. 
BY W. G. BINNEY. 
The following species of HelicidaB, now first described, were collected by Dr. 
F. V. Hayden, of the Yellowstone Ex. Ex., (Lieut. G. K. Warren), Dr. T. S. 
Newberry, of the Colorado R. Ex. Ex., (Lieut. Ives), Mr. Robert Kenicott, during 
a recent visit to the Red River of the North, and in Mexico by the late Mr. Ber- 
landiere, whose valuable collections were bought and presented to the Smith- 
sonian Institute by Lieut. Couch. Specimens of all the species are deposited 
in the collection of that Institution, and also in that of the Academy, through 
the kindness of Prof. Baird, and the gentlemen named above. Figures of these, 
and all species described by me, will be published at some subsequent time. 
SucciNEA HAYDENi. — Tcsta clongato-ovalis, tenuis, pellucida, succinea ; spira 
parva, acuta; anfr. 3 convexi, ultimus rugis levibus incrementalibus et 
sulcis crassis spiralibus, interruptis, inequaliter notatus ; sutura mediocris : 
columella callo levi induta, apicem interiorem a basi testae mostrans ; apertera 
obliqua, ovalis, S-'Zlong. testae aequans, ad basin expansior. Long. 21 ; diam. 9 
mill. 
Habitat in provincia Nebraska, frequens inter flumina " Loup Fork," et " L'eau 
qui court" Dr. F. V. Hayden I (Yellowstone Ex. Ex.) 
[May. 
I 
