FOSSILS OF THE MEDIAL TERTIARY of the UNITED 

 STATES, by T. A. Conrad. No. 2. containing 12 Plates, recently 

 published and for sale by J. DOBSON, No. 106 Chestnut street. 



A MONOGRAPH of the FLUV1ATILE BIVALVE SHELLS 

 of the RIVER OHIO, containing Sixty-eight Species. Translated 

 from the French of C. S. Rafinesque, by C. A. Poulson. For sale 

 by J: DOBSON, No. 106 Chestnut street. 



Generic Labels for Cabinets of Shells. 



The subscriber respectfully informs Conchologists and Curators ol 

 the different Lyceums of Natural History, that he has published, in 

 sheets, complete sets of the names of all the genera of Shells, in such 

 a way that they can be easily cut up into neat labels, of uniform length 

 and breadth. To facilitate the finding of any desired genus, the genera, 

 about 305 in number, have been printed alphabetically. Each set of 

 genera is accompanied by a set of labels of the six classes of the Mol- 

 lusca, printed on a different coloured paper, and in a larger type. — 

 Price One Dollar per set. 



E. G. DORSEY, 12 Library street 





