376 [Auaust, 
Algo a resolution that the amendment should not take effect on the 
present members of the Institution until after January 1, 1854. 
Dr. McKwen announced the decease of John Price Wetherill, late 
Vice-President of the Academy, and moved the appointment of a Com- 
mittee to draft resolutions expressive of the sense of the Academy of the 
loss which it has sustained. 
The Committee, consisting of Dr. McHwen, Dr. Hays and Mr. Vaux, 
after having retired for a short time, reported the following Resolutions, 
which were unanimously adopted : 
Resolved, That the Academy profoundly regrets the loss which it has sustained 
by the death of its late Vice President, Joan Price Wetueritt, who for thirty 
years has been an active and useful member, contributing liberally to its Libra- 
ry and Cabinet, and, where occasion required, to its funds; and who, by his 
zealous and untiring efforts for the promotion of the objects of the Academy, 
has largely contributed to its present prosperous condition. 
Resolved, That the members of the Academy, individually, have lost a warm 
friend; one whose advice and sympathy were always ready in those peculiar 
circumstances requiring a sound, discriminating judgment. 
Resolved, That in testimony of respeet for his memory, the members of the 
Academy will attend his funeral in a body, and that the President’s chair be 
dressed in mourning for three months. 
ELECTION. 
John C. Bullitt, Esq., of Philadelphia, was elected a Member. 
August 2d. 
Vice-President BriIpGES in the Chair. 
The following letter from Mr. Isaac Lea, dated Langen Schwalback, 
Duchy of Nassau, June 21, 1853, addressed to Dr. Leidy, was read : 
‘¢ My kind friend, Professor Dunker, of Cassel, most generously gave me his 
only specimen of a rare species of the family Naiades of Lamarck, under the name 
of Castalia sulcata, Krauss. On examining it, I found that while it had some 
of the general characters of this genus, (Pristdon, Schum.,— Castalia, Lam.,) it 
had not that of the striate teeth. It therefore properly belongs to the Uniones, 
and must be placed in the triangular group of that genus. In this translation it 
loses its specific name, as that has long since been applied by me to a species of 
Unio from the Ohio river. I therefore propose to name it after the able natural- 
ist, Prof. Krauss, of Stuttgart, who has been the first to describe it, and it will 
follow in my systematic arrangement after Unio triangularis, Barnes, under the 
name of Unio Kraussit Lea, with the synonym of Castalia sulcata, Krauss. 
In Prof. Dunker’s interesting collection, [ observed a nearly perfect valve of 
a Naiad, from Liberia, under the name of Anodonta Herculea, Middendorf. 
This, I have no doubt, is the Dipsas plicatus, Leach. The dimensions of this 
specimen are greater than any I have ever seen of the family of Naiades. Its 
breadth is 124 inches, and its length 74 inches, which is greater than the speci- 
men in the collection of our Academy. 
I also observed in Prof. Dunker’s collection his Unio maeropterus,* which is 
the same as my Unio superbus, and therefore is a synonym to the latter. His 
*Its habitat is found to be Danu-Luar River, Island of Sumatra. 
