THE NAUTILUS 



Tbid species has heretofore been found, I believe, in New ^Mexico. 

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

 reported. 



PRELIMINARY LIST OF NORTH AMERICAN PUPID^. 

 (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. Strange 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 couutiy. 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, Montana, 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 an}-^ 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 want of 

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

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

 the names, and giving localities representing areas of distribution. 



