12 
PROCEEDINGS OP THE ACADEMY OP 
March 16. 
Yice-President Bridges in the Chair. 
Thirfcy-two members present. 
The following papers were presented for publication in the Proceed- 
ings : '^Descriptions of New Species of Coleoptera, chiefly collected by 
the U. S. and Mexican Boundary Commission, under Major W. H. 
Emory, by John L. LeConte, M. D/' 
Descriptions of New Species of Neuropterous Insects, collected by 
the North Pacific Exploring Expedition under Captain J. Rodgers, by 
P. R. Uhler/^ 
Dr. Leidj called the attention of the members to a cast of a Mastodon tooth 
from the collection of Dr. Harlan, which collection had for many years been 
stowed away in a ware-house in this city, and had recently been presented to 
the Academy by the son of Dr. Harlan. The cast is labelled in the hand-writing 
of the Id^iiQv^ Mastodon longirostris WiocQxiQ^ Maryland." The original speci- 
men is said to have been found in a miocene deposit, near Greensburgh, Caroline 
county, Md. For some time it was in the possession of Dr. Ducatel, of Balti- 
more, and subsequently was deposited in the Museum of that city, Mr. Charles- 
worth, Sir Charles Lyell, Dr. Harlan and Dr. Hays, who had seen the specimen, 
considered it as having belonged to the M. longirostris or if. augustidens. When 
Dr. Warren was preparing his book on the american Mastodon, he was desirous 
of inspecting this tooth, but learned that it was lost. Subsequently, a tooth, in 
the cabinet of the Academy, which had been purchased in London as an ameri- 
can fossil, was suspected to be the missing Baltimore specimen, and as such is 
described and figured in Dr. Warren's work, (The Mastodon giganteus of North 
America, p. 92, pi. xxvi.) This tooth, now on the table, by comparison with the 
cast, proves not to be the so-called Baltimore tooth, though approaching it in a 
remarkable manner, in size, general form, and in being fractured at the anterior 
extremity. 
Dr. Leidy next exhibited a tooth from the collection of Dr. Harlan, which Dr. 
Hays says is the original specimen on which the Tapirus masiodontoides was 
founded. The specimen corresponds in size and form very nearly with the 
description given by Dr. Harlan in his account of T. masiodontoides (Fauna 
Americana, p. 224 ; Medical and Physical Researches, p. 265.) Dr. L. added, 
he confirmed the views of Mr. Cooper (American Monthly Journal of Geology, 
p. 163,) and Dr. Hays, that the specimen was a first milk molar of the Mastodon. 
March 2Sd, 1858. 
Vice-President Bridges in the Chair. 
Forty-eight members present. 
The Rev. Dr. Morris, on the part of the local committee of the Ameri- 
can Association for the advancement of Science, extended to all the 
members of the Academy, an invitation to be present at the next meet- 
ing about to be held in Baltimore, to which he added the promise of 
the cordial hospitality of the citizens. 
The following papers were presented for publication in the Proceed- 
ings : 
Descriptions of a New Helix and two new Planorbes, by Isaac Lea." 
Descriptions of eight new species of Unio, by Isaac Lea.'' 
Which were referred to committees. 
[March 
