14 VIVIPARA. 
ra, Linn. (= lineata, Kiister), Georgiana, 
Lea, Bengalensis, Hald. (= Waltont, nob.) 
carinata, Val., inornata, Binney. 
MELANTHO, subpurpurea, Say, pon- 
derosa, Say, decisa, Say, genicula, 
Conrad, integra, Say, TZerana, Tryon, 
De Campi, Currier, Nolani, Tryon, subsolida, 
Anth., coarctata, Lea, obesa, Lewis, rufa, Hald., 
Milesti, Lea, gibba, Currier, lima, Anthony, 
exilis, Anth., incrassata, Lea, Troostiana, Lea, 
Haleiana, Lea. 
TuLotoma, bimonilifera, Lea. 
It is a curious fact that the family Vivipa- 
ride is not represented west of the Rocky 
Mountains by a single species (nor is it found 
at all in South America), although the Rissoi- 
dee, Valvatidee and Limneide are all repre- 
sented there. 
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