NATURAL SCIENCES OF PHILADELPHIA. 21 



the median lobes reduced to a minute condition. A strong basal 

 ridge bounds the crown externally, a thin one anteriorly , and 

 a strong festoon-like portion at the bottom of the inner lobe pos- 

 teriorty. The second specimen, an isolated tooth, is a diminished 

 representative of the one described. It may be a last upper or 

 other premolar of the same animal, or a corresponding true molar of 

 a smaller species. We have no means of determining the proba- 

 bility of these specimens belonging either to Omomys or Triaco- 

 don, and I propose to name the animal to which they pertained 

 I'alseacodon verus. The larger tooth is 2 lines fore-and-aft, and 2^ 

 lines transversely; the smaller one is 1| lines fore-and-aft, and 2 

 lines transversely. 



February 13. 

 The President, Dr. Ruschenberger, in the chair. 

 Twenty-one members present. 



February 20. 



Mr. Wm. S. Vaux, Vice-President, in the chair. 



Twenty-four members present. 



The following paper was presented for publication: "On an 

 Extinct Whale from California." By Edw. D. Cope. 



February 27. 



Mr. Wm. S. Vaux, Vice-President, in the chair. 



Nineteen members present. 



On favorable report of the committees, the following papers 

 were ordered to be published : 



1872.] 



