walker: shells of Michigan. 327 



authority it will be understood that all the species cited are 

 represented in my cabinet by Michigan specimens. It may be 

 well to add that while my own collecting has been done principally 

 in the southeastern portion of the state, I have received several 

 small collections from the northern part of the lower peninsula, 

 and am especially indebted to Mr. L. H, Streng of Grand Rapids, 

 for a very complete set of the shells of the western part of the 

 state, including a number of species that I have not met with 

 myself 



It is much to be regretted that there is no published account 

 of any collections made in the northern peninsula; and while the 

 species described in Agassiz' "Lake Superior" from the north 

 shore have been quoted by Currier and are given in the present 

 list, on account of the probability that they will be found on the 

 southern shore also, yet in regard to most of them, there is no 

 authentic record of their occurrence within the boundaries of the 

 state. The recent discovery of one of these species in the 

 northern part of the lower peninsula certainly tends to verify the 

 supposition, and indeed there can be no doubt but that as the 

 various portions of the state, especially the northern and southern 

 borders are more thoroughly explored, many hitherto unrecorded 

 species will be added to our fauna. 



Macrocyciis concava Say. 



Zonites fuliginosus Griff. 



Z. ligerus Say. 



Z. inornatus Say. Miles, Currier. 



Z. cellarius Miill. About two years ago I found a few 

 specimens of this species in a green-house in Detroit. It is the 

 first time I believe that it has been detected in the state. 



Z. nitidus Miill. 



Z. arboreus Say. 



Z. viridulus Mke. 



Z. indentatus Say, 



