ADYERTISEMEXT. 



The following Lists of the described species of Invertebrate 

 Fossils of Nortli America have been prepared at the request of 

 the Institution for the purpose of facilitating the labelling of the 

 collections and the distribution of duplicate sj^ecimens. 



It will be readily understood that the Smithsonian Institution 

 cannot vouch for the accuracy of the Lists, or for their complete- 

 ness, and that all responsibility in reference to these points rests 

 with the authors. 



JOSEPH HEXRY, 

 Secretary S. I 



Smithsonian Institdtion, 



Washington, April, 18G4. 



(ii) 



PHILADELPHIA : 

 COLLINS, PRINTER. 



