THE NAUTILUS. 129 



Campeloma decisa Say. Cass River. 



Amnicola porata Say. 



Bythiuella obtusa Lea. 



Gouiobasis livescens Mke. Saginaw Bay. 



Goniobasis semicarinata Say. Saginaw River. 



This is the first time this species has been cited from this State. 

 Goniobasis depygis Say. Saginaw River. 



This species, although cited in the earlier lists of Sagerand Miles, 

 has not been found by any of the more recent collectors. 

 Goniobasis milesii Lea. Cass River. 



Two specimens "from Dr. Miles," which seem to justify Tryon's 

 doubt as to whether the species is more than a globose form of G. 

 livescens Mke. 



Unio alatus Say. Saginaw River. 



Unio asperiraus Lea. Saginaw River. This is the first recorded 

 occurrance of this species in the eastern part of the State. It may 

 be of interest to add that Dr. W. H. DeCamp of Grand Rapids 

 informs us that the species has also been recently found in the Grand 

 River, so that the doubt formerly cast upon its occurrence in Michi- 

 gan must be considered as entirely removed. 



Unio cornutus Bar. Another addition to the fauna of the eastern 

 part of the State. One example, probably a female, is unusually 

 elongated. 



Unio ellipsis Lea. This and all the following species are from Sag- 

 inaw River. 



Unio gibbosus Bar. Anodonta benedictii Lea. 



gracilis Bar. footiana Lea. 



ligamentinus Lam. imbecilis Say. 



luteolus Lam. Sphierium striatinum Lam. 



nasutus Say. rhomboideum Say. 



novi-eboraci Lea. occidentale Pme. 



phaseolus Hild. parturaeium Say. 



rectus Lam. truucatum Lam. 



rubiginosus Lea. Pisidum virginicum Lam. 



schoolcraftii Lea. ' abditum Hald. 



ventricosus Bar. compressum Pme. 



Margaritina deltoidea Lea. variabile Pme. 



