Shells. 



23 



Cyclas. 



dubia,* Say. 



And two species not described. 



IL— UNIVALVES. 



Paludina. 



decisa, Say. 

 limosa'? Say. 

 Planorbis. 



trivolvis, Say. 

 bicarinatus, Say. 

 armigerus, Say. 

 campanulatus. 

 parvus, Say. 



Lymnaea. 



catascopium, Say. 

 heterostropha, Say. 

 columella, Say. 

 And one species not ascertained. 

 Valvata. 



arenifera 1 Lea. 



LAND SHELLS. 



Helix. 



albolabris. Common Wood Snail. 

 arboreus, Say. 

 tridentata, Say. 

 alternata, Say. 

 glaphyra, Say. 

 thyroidus, Say. 

 minuta, Say. 

 hirsuta, Say. 

 labyrinthica, Say, 

 perspectiva, Say. 



fraterna, Say. and two other species. 



AMPHIBIOUS. 



Succinea 



ovalis, Say. 



campestris 1 Say. 



and one species not ascertained. 



Pupa. 



corticaria? Say. 

 Caracolla. 



one species not ascertained. 



* This does not agree exactly with my specimens of the dubia found in Pennsylvania, but I think 

 it not sufficientlydistinct to be separated from that species. 



In the first edition of this Report, there followed in this place a List of shells 

 observed on and near the coast of New England, by Col. Joseph G. Totten, contain- 

 ing about 125 species. But the Boston Society of Natural History have recently 

 prepared with much care a catalogue of all the shells ascertained to exist within 

 the limits of Massachusetts up to the present time (Oct. 1834,) and embracing 

 nearly all the species in Col Totten's Catalogue. I could not doubt, therefore, 



