Sterki: North American Sph.^riid.e. 431 



Synonyms are added only as they appear to be necessary for identi- 

 fication. Distribution is given in a general way by states and prov- 

 inces. Fossil species cited in the same way must be understood as 

 having been obtained from marl and glacial and post-glacial deposits. 

 The numbers of the entries cited refer to the collection of the Spha?riidae 

 in the Carnegie Museum, unless otherwise stated. An alphabetical 

 list has been added for use in checking and as an index. 



A few directions for collecting and handling material are given 

 with a view to making this work easier and more successful on the 

 part of those who are doing field-work. These directions are embodied 

 in a brief article which immediately succeeds the present catalog in 

 the order of publication. Reprints of this article will be supplied b>- 

 the author or by the director of the Carnegie Museum to those who 

 may desire information as to the best manner of collecting the smaller 

 mollusca, and especially to those who may wish to aid the Museum in 

 making its collections complete. 



Thanks are extended by the writer to the many malacologists, who, 

 by making collections, or by loaning specimens, have aided him in his 

 researches. A list of these, together with an account of their work 

 will be published in a forthcoming monograph, but the writer cannot 

 refrain from here mentioning his special indebtedness to Dr. Bryant 

 Walker of Detroit, Michigan, for his many favors and the literary 

 references which he has given him. 



The following abbreviations are employed throughout this paper: 

 Boston Proc. for "Proceedings of the Boston Society of Natural 

 History"; Mon. Corh. for "Monograph of the North American 

 Corbiculadse," by Temple Prime. Smithsonian Miscellaneous Collec- 

 tions, 1865. 



Family SPH^RIID.F:. 



Genus Sph^rium Scopoli. 



I. Sphaerium sulcatum (Lamarck). 



Cyclas sulcata Lamarck, An. sans Vert., V, 1818, p. 560. 



Cyclas similis Say, Nicholson's Encycl. Ed. IX, 1818 (?), PL I, fig. 9. 



Sphcerium sulcatum Prime, Mon. Corh., p. 33. 



Habitat. — East of the Rocky Mountains, rare in the South. 

 Fossil. — IVIaine, New Jersey, Ohio, Michigan, Illinois. 



