2 THE NAUTILUS. 



This species has heretofore beeu found, I believe, in New INIexico. 

 Mr. Baker's collection carries it farther to the south than before 

 reported. 



PRELIMINARY LIST OF NORTH AMERICAN PUPID.ffi. 

 (NORTH OF MEXICO.) 



BY DR. V. STERKI, NEW PHILADELPHIA, OHIO. 



It will take several years more before we can attempt a revision 

 and approximately complete a list of this most interesting group of 

 our land mollusca. The past few years have brought us a good 

 number of new forms, and yet we have to expect, not only more 

 such but also a more extensive knowledge of their geographic 

 distribution and local variations. -vStrange as it may appear, the 

 specimens extant in the many museums and private collections I have 

 examined, represent only a very limited pare of our country. There 

 are areas of 100,000 square miles from which none of these minute 

 denizens are known, or only a few from single spots. Very little, in 

 some places nothing, has been collected in the South Atlantic and 

 Gulf States, excepting Florida and Texas ; in Kentucky, Wisconsin, 

 Minnesota, the Dakotas, Wyoming, Idaho, Oregon; some more, but 

 still very insufficiently, in a part of the New England States, Pennsyl- 

 vania, except the southeastern region, Michigan, Maryland, Ten- 

 nessee, Arkansas up to Iowa and Nebraska, INIontana, Washington, 

 Colorado, New Mexico, Arizona, Nevada, not to speak of British 

 North America, a part of whose regions are, however, better known 

 in this regard than some of the oldest states of the Union. Com- 

 paratively, most has been done in Maine, Massachusetts, New York, 

 Ohio, Florida, parts of Texas, and California; sufficient to give us 

 a fair knowledge of the distribution of not even a majority of the 

 species, in any one State ! 



It appears, therefore, advisable to give a preliminary list of the 

 species and forms described and cited as from our continent. In 

 many instances it is impossible, as yet, to 'say whether a certain 

 form is to be considered a species or a variety, for Avant of 

 sufficient material ; and future critics will have to decide. In all 

 such cases I prefer, here, leaving the question open, and simply filing 

 the names, and giving localities representing areas of distribution. 



