Appendix. ^t3 



Zonites viridula, Mke., (common). 



Zonites ligera, Say, (common). 



Zonites minuscula, Binney, (South). 



Zonites fulra, Drap., (common). 



Tebennophorus Carolinensis, Bosc, (not abundant). 



Family, Auriculidm, 

 Carychium exiguum, Say, (common). 



F AM I i.Y , LiinnceidL^. 

 Limna^a columella, Say, (rare). 

 Limucea humilis. Say, (common). 



Limn^astagnalis, Linn., (rare), lakes west and Huron River. 

 Limn^ea palustris, Mull., (Swamp north-east). 

 Limneea desidiosa, Say, (common). 

 Physa gyrina, Say, (^common). 

 Physa gyrina, var. hildrethiana, (common ). 

 Physa Sayii, Tappan, (small lakes west). 

 Physa heterostropha. Say, (common). 

 Bulinus hyphnorum, Linn., (North-east, common early in 



June). 



Planorbis campanulatus, Say, (rare). 

 Planorbis trivolvis, Say, (common). 

 Planorbis bicarinatus. Say, (common). 

 Planorbis exacutus. Say, (common). 

 Planorbis albus. Mull., (rare). 

 Planorbis parvus. Say, (common). 

 Planorbis deflectus, Say, (not abundant). 

 Segmentina armigera. Say, (common). 

 Ancylus tardus, Say, (common). 

 Ancylus parallelus, Hald.,(?) (uncommon). 



Class, C%6?/z^/«/m7.— (Section, Asiphonida.) 

 Family, Unionidce. 



Unio multiradiatus, Lea, (common). 



Unio gibbosus, Barnes, (common). 



Unio luteolus, Lam., (rare). 



Unio verrucosus, Barnes, (common). 



