376 [August, 



Also a resolution that the amendment should not take effect on the 

 present members of the Institution until after January 1, 1854. 



Dr. McEwen 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. McEwen, 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, John Price Wetherill, 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 w^ere always ready in those peculiar 

 circumstances requiring a sound, discriminating judgment. 



Resolved, That in testimony of respect 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 Bridges 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 Danker, of Cassel, most generously gave me his 

 only specimen of a rare species of the family Naiades of Lamarck, under the name 

 of Castalia sidcata, Krauss. On examining it, I found that while it had some 

 of the general characters of this genus, {Prisidon, Schum. ,= Castali'a, Lam.,) it 

 had not that of the striate teeth. It therefore properly belongs to the Tlnloyres, 

 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 

 Jj7iio 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 U)uo triangularis, Barnes, under the 

 name of TJnio Kraiissii Lea, with the synonym of Castalia sulcata, Krauss. 



In Prof. Dunker's interesting collection, I 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 12j inches, and its length 7^ inches, which is greater than the speci- 

 men in the collection of our Academy. 



I also observed in Prof. Dunker's collection his TJnio macroptents,* which is 

 the same as my TJnio superbus, and therefore is a synonym to the latter. His 



*It3 habitat is found to be Danu-Luar River, Island of Sumatra. 



