78 PROCEEDINGS OF [April, 
the Genus Tetracauladon, &c., &c., by Dr. Isaac Hays .—From 
Dr. Isaac Hays , of Philadelphia. 
Description of a fragment of the Head of a new Fossil Animal, dis¬ 
covered in a Marl pit, near Morristown, New-Jersey, by Dr. Isaac 
Hays .—From Dr. Isaac Hays , of Philadelphia. 
Description of a new Genus, and new species of extinct rnammiferous 
Quadrupeds, by Dr. John G. Goodman .—From Dr. Isaac Hays, 
of Philadelphia. 
Letters were read :— 
From Professor Gerard Troost, of Nashville: Announcing his in¬ 
tention to make up a collection “ of the Natural Products of Tennes¬ 
see , 55 for the Cabinet of the Institution. 
From John Y. Ingersoll, of Mineral Point, Wisconsin: Stating that 
he and Mr. Stephen Taylor had forwarded for the Cabinet of the 
Institution, specimens of remains of an ancient city, called Atzalan, 
and that they would shortly forward a communication on the sub¬ 
ject. 
From John Locke, Cincinnati: Recommending Mr. C. Evans’ in¬ 
vention called the “ Steam Safety Guard.” 
From B. S. Roberts, Plattsburgh: Describing measures he had 
taken to procure for the Cabinet of the institution the Geology and 
Mineralogy of Western New-York. 
From M. F. Maury, U. S. Navy: Enclosing a letter from Captain 
Hunter, of the Revenue service, offering to aid in making collections 
for the Cabinet of the Institution. 
From Wm. R. Staples, Providence, Rhode-Island: Informing the 
Institution that the Collections of the Rhode-Island Historical So¬ 
ciety would be regularly transmitted to it. 
From Charles Baldwin: Suggesting the advantage of adding a De¬ 
partment of Statistics to the Institution. 
From David Dale Owen: Stating that he had shipped the collec¬ 
tion of Minerals and Geological specimens lately made by him, while 
employed by the United States General Land Office, and that he 
had added a series of the Maclure Minerals, presented by Alexander 
Maclure, of New-Harmony, Indiana. 
