No. 3. Dated (front cover) August, 1883, (back cover) August 

 24, 1833 ; presented to the library of Phila. Ac. Nat. Sci., 

 Sept. 3, 1833 (see notes above) ; the last may be taken as 

 the true date of publication ; description of 40 Claiborne 

 Eocene fossils, plates mentioned but not given. A reprint 

 of this and the following number was made by Capt. A. W. 

 Vogdes in 1879. 



No. 4. Dated (front cover) October, 1833, (back cover) Nov. 1, 

 1833 ; presented to the library, Phila. Ac. Nat. Sc., Nov. 26, 

 1833 ; the last may be taken as the true date of publication ; 

 description of 77 Claiborne Eocene species, no plates. 



REPUBLICATION OP No. 3. 



Dated March 1, 1835; a revision of about two-thirds of the 

 specific descriptions of univalves found in No's 3 and 4, together 

 with new matter, accompanied by illustrations. 



The Map. Just within the front cover of this edition, Conrad 

 placed a small Travellers' guide map of Alabama, on which he 

 indicated the distribution of the different geological formations 

 of the State by various colors, as follows : " Primary " light 

 red ; " Carboniferous or Grauwacke group " blue ; " Bitumi- 

 nous coal " black ; " Greensand " green ; " Newer Cretaceous 

 strata, a link between the Greensand and Eocene" orange yel- 

 low; " Eocene " pinkish orange ; " Recent formation or bed of 

 Rangia cyrenoides, a living shell of the gulf estuaries "yellow. 



Between pp. [7G-77] of the present volume, a small map, about 

 one-half the scale of Conrad's, is given which shows part of the 

 geographical and all of the geological features of the original. 



Observations on the Eocene deposits of the United States. The 

 two editions of these " Observations " found on pp. [77-84] and 

 PI*. [85-92] respectively of the present work, differ but little ex- 

 cept on the last page of each, i. e., page 3C of the original. The 

 former is the more common, being found in all but three of the 

 copies examined by the present writer. It was published about 

 March 1, 1835. The edition found on pp. [85-92] is of a later 

 date, either 1836 or 1837. Some of the facts substantiating this 

 statement are as follows : 



1. Typographical errors like the omission of the word "to" 

 between "me" and "suppose" on p. [78], the omission of one 

 "s "in the word "thicknes" on page [80], and placing an "r" in 



[7] 



