[891. J WALTON— MOLLUSCA OF MONROE COUNTY. 13 



Physa plicaia, De Kay. 

 " osculans, Hald. 

 " striata, Mke. 

 " subarata, Mke. 

 " Charpeniieri, Kust. 

 " Philippic Kust. 

 " inflata, Lea. 

 Bulla crassiila, Dill. 

 CocJilea 7ieritoides, List. 

 Bulimus hypnorum, Lin. (pi. 6, fig. 22.) Pittsford. 

 Physa elongata, Sa}'. 

 " glabra, De Kay, 

 " elo/igatina, Lewis. 

 " turrita, Sowb. 

 Aplexa hypnorum, Chem. 

 Planorbis trivolvis, Say. (pi. 7, fig. i, 4.) Charlotte. 

 Bulla fluviatilis, Say. 

 Planorbis regularis, Lea. 



" megasoma, De Kay. (pi. 7, fig. 5.) 

 " corpulefiius, De Kay. (pi. 7, fig. 10.) 

 " proboscideus, Pott. 

 " lentus, Gld. 

 Cochlea triumorbiutn, I^ist. 

 Planorbis campanulatus, Say. (pi. 7, fig. 7, 8.) Pittsford. 

 Planorbis bcllus. Lea 



" bicarinatus, Sowb. 



Helix angulata, Shepp. 

 Planorbis bicarinatus, Say. (pi. 7, fig. 9.) Rochester. 

 Planorbis engonatus. Con. 

 Helix angulata, Rack. 

 Planorbis deflectus, Say. (pi. 7, fig. u.) Brighton. 

 Planorbis virens, Ad. 



" obliquiis, De Kay. 



Planorbis parvus, Say. (pi. 7, fig. 6.) Charlotte. 

 Planorbis concavus, Anth. 

 " elevatus, Ad. 

 Segmentina armigera. Say. (pi. 7, fig. 12.) Brighton. 

 Ancylus rivularis. Say. (pi. 7, fig. 14.) Genesee river. 

 Ancylus tardus, Say. (pi. 7, fig. 13. ) Irondequoit. 

 Ancylus parallelus, Hald. (pi. 7, fig. 15.) Charlotte. 



