208 BULLETIN OF THE 



Tebennophorus Caroliniensis, Pallifera dorsalis, and Limax campestris 

 probably have also come down from Post-pleiocene times. From their 

 nature they could leave no record of their presence in the " bluffs." 



There are also found in the Interior Region several forms of Succinea 

 which have been described as 



Succinea retusa. Succinea aurea. 



Grosvenori. Mooresiana. 



lineata. 



The following is a complete list of those species of Jhe Interior Region 

 which have, spread beyond it by passing the barriers of the Appalachian 

 chain, and are now found over New England and the whole southern ex- 

 tension of the Northern Region, described on p. 203, as well as over the 

 whole Southern Region. They may, therefore, be said to inhabit all 

 of the Eastern Province. 



Macrocyclis concava. Helix fallax. 

 Zonites fuliginosus. albolabris. 



inomatus. thyroides. 



suppressus. Pupa pentodon. 

 indentatus. fallax. 



arboreus. armifera. 



minusculus. contracta. 



Limax campestris. rupicola. 



Patula alternata. corticaria. 



Helix lineata. Vertigo milium, 

 labyrinthica. ovata. 



hirsuta. Succinea avara. 

 monodon. obliqua. 



palliata. Tebennophorus Caroliniensis. 



tridentata. Pallifera dorsalis. 



Helix Sayii and Helix dentifera have spread into New England only 

 from the Interior Region. They have not been found in more southern 

 latitudes on the Atlantic slopes of the Appalachian chain, nor in the 

 Southern Region. 



The geographical range of these species is very great, forming one 

 of the most striking features of the North American fauna. Still more 

 widely distributed are those minute species which have been mentioned 

 above as spreading southwardly from the Northern Region equally on 

 both sides of the Sierra Nevada and Rocky Mountains. These species 



