Sept. 3d, 1833. Mr. Conrad's work, Fossil Shells of the Ter- 

 tiary formation,' presented to the Library. (Presumed 

 to be to No. 3, inclusive.) 



Nov. 26th, 1833. Dr. Morton presented to the Library the 4th 

 No. of Conrad's < Tertiary Fossils.' 



Dec. 10th, 1833. Lea's ' Contributions to Geology,' (including 

 his paper on Tertiary Fossils of Alabama,) presented by 

 the author." From the Minute Book, Phila. 'Ac. Nat. 

 Sc. See Am. Journ. Con., vol. 1, 1865, p. 190. 



A brief and incomplete bibliography of Conrad's "Fossil Shells" 

 and "Medial Tertiary" by Otto Meyer occurs in the August 

 Number of the American Naturalist, 1888, pp. 720-727. Mr. 

 Meyer's information was apparently derived chiefly from an ex 

 amination of his own copies and thoso at the Philadelphia Acad- 

 emy of Natural Sciences. 



In his " Monographic de la Faune Koconique de 1'Alabama," 

 1890, p. 7, M. Antoine de Gregorio gives a very careful account 

 of his two imperfect copies of " Fossil Shells, &c." He first 

 called attention to the fact that there were two editions of pp. 

 iii.-vi., No. 1. 



A much more elaborate account of Conrad's " Fossil Shells, &c." 

 and " Medial Tertiary " may be found in vol. xii., Bull. Phil. Soc. 

 Wash., pp. 215-239, Jan., 1SU3, by William H. Dall. This is of 

 special interest from a historical standpoint since it states the 

 circumstances under which the former work was written and the 

 causes which led to the attempted suppression of some of its 

 Numbers. Additional notes on " Fossil Shells, &c.," by the pres- 

 ent writer occur in the April No. of the American Geologist, 

 1893. The following also contain some new matter : 



FOSSIL SHELLS OF THE TERTIARY FORMATIONS OF NORTH AMERICA. 



No. 1. Dated October 1, 1832 ; probably about the true date of 

 publication ; 23 species described and figured, nearly all 

 post-Eocene. There were two editions of pp. iii.-vi.; pp. 

 [13-16] represent the original, pp. [19-22J the revised ; the 

 date of the latter is not definitely known. (See April No. of 

 Amer. Geol., 1H93.) 



No. 2. Dated December, 1832 ; description and illustration of 

 17 species ; about one-half Eocene and one-half post Eocene. 



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