232 DAVEXPORT ACADEMY OF NATURAL SCIENCES. 



bers : S""- Gumesindo Mendoza, S""- Alfonso Herrera, S""- 

 Mariano Barcena, S""- Dr. Manuel M. Vilado, and S""- Jesus 

 Sanclies, of the National Museum, Citv of Mexico ; S""- Dr. 

 Eugene Duges, Guanajuate, Mexico ; S""- Dr. Gregorio Barroeta, 

 S""- Don Antonio Espinoza j Cerv^antes ; and S''- Dr. J. A. Pier- 

 nas, San Louis Potosi, Mexico. 



Mr. Crandall reported that Mr. L. H. Morse, of this city, 

 proposed to photograph, by the new chromotjqDe process, all 

 the officers of the Academy, together with the members who 

 have been most active in building up the Academy, and to 

 donate the same to the Historical Section. This offer was 

 accepted with a vote of thanks. 



The following paper was read and referred to the Publication 

 Committee : 



Catalogue of the Marine Shells of Florida, with Notes and Descrip- 

 tions of Several New Species. 



BY W. W. CALKINS, CHICAGO. 



The material for the following monograph has been mainly derived 

 from my own collections, and observations made during two winters 

 spent in Florida— in 1875 and 1877. The first time as member of an ex- 

 pedition in the interest of the Chicago Academy of Sciences, and in 1877 

 on my own account. In addition to my personal collections, I have 

 received since my return valuable accessions from my collectors living 

 in Florida. In the determination of species I have been assisted in 

 many instances by Mr. George W. Tryon, jr., of Philadelphia, to whom, 

 and also to Mr. Thomas Bland, I desire to express my acknowledgments 

 for kindly aid. While possessing myself a fine series of Conchological 

 works, I regret my inability to look over the libraries and museums of 

 eastern societies for purposes of study and comparison. I have, how- 

 ever, taken the utmost care to identify species. I am led to prepare this 

 paper from a feeling that even a catalogue, if it be nothing more, is a 

 desideratum among students of American conchology, who have been 

 obliged, like myself, to search through hundreds of volumes for informa- 

 tion that perhaps a mere list would afford. It is often a satisfaction to 

 know ?/;/i,ere a certain shell can be found. I do not, of course, give all 

 the Florida species. There are many which can only be obtained by 

 dredging in deep water. But a fair representation appears of the littoral 

 faunas of both coasts, and the Keys at the southern extremity of Florida. 

 It will be seen that West Indian forms are quite common. The geo- 

 graphical range of the species is one of interest in connection with 

 geological changes in Florida, which have governed their distribution. 

 Dr. Stimpson refers to this in the American Naturalist, Vol. 4. It 



