42 



seems to live almost equally as well on one kind of shore or bottom 

 as on another, effort will be made to put its habitats in order of pref- 

 erence. In case the species prefers brackish water, this will also be 

 recorded in this column. The third and fourth columns of these en- 

 vironmental items show the extreme northern and extreme southern 

 geographical ranges of the different species. 



In the tables there will occasionally be found the name of a species 

 and not very much additional information concerning it, perhaps only 

 where it has been found as a fossil. This has come about by taking 

 Holmes' list to make this list as full as possible. Occasionally a 

 species, mentioned and described by Holmes, has not been found de- 

 scribed anywhere else in the literature accessible, and consequently 

 the columns are left blank opposite such species. This is true of five 

 of the six species of Fitsus that he gives ; true, also, of Columbella or- 

 nata and Volvo, aciculoris. Just after the main tables are found lists 

 of Pleistocene fossils from localities in other States. These lists 

 have been placed here for convenience in ready comparison. 



In addition to the facts obtained at first hand, the following pub- 

 lications were used in making out these tables : 



"Manuel de Conchyliologie et de Paleontologie Conchyliologique." 

 Dr. Paul Fisher, Paris, 1887. 



"Einleitung in die Geologie als Historiche Wissenschaft." Johannes 

 Walther, Jena, 1893. 



"Geological Biology." H. S. Williams, New York, 1895. 



"Report upon the Invertebrate Animals of Vineyard Sound and 

 Adjacent Waters." A. E. Verrill and S. I. Smith, Washington, 1874. 



"Report on the Invertebrata of Massachusetts." A. A. Gould, 

 Edited by W. G. Binney, Boston, 1870. 



"Structural and Systematic Conchology." George W. Tryon, Jr., 

 Philadelphia, 1882- 1884. 



"A Preliminary Catalogue of the Shell-bearing Marine Mollusks 

 and Brachiopods of the Southeastern Coast of the United States." 

 W. H. Dall, Bulletin No. 37, U. S. Nat. Museum, 1889. 



"American Conchology or Description of the Shells of North 

 America." Thomas Say, New Harmony, Ind., 1830. 



Dr. W. H. Dall's work in the Transactions of the Wagner Free 

 Institute of Sciences, Parts 1-6, Vol. Ill, Philadelphia, 1890-1903. 



Republication of Conrad's "Fossil Shells of the Medial Tertiary of 

 the United States," with an Introduction by W. H. Dall. Wagner 

 Free Institute of Sciences, 1893. 



