84 LIOPLAX. 
Genus LIOPLAX, Troschel. 
Synonym, Haldemania, Tryon. 
omen 
1. LIOPLAX SUBCARINATA, Say. 
Haldeman, p. 8, t. 2. 
Plate 13, fig. 1. 
Haldeman’s figures 1 and 2 represent the 
full size of eastern forms of this species, but in 
the west it attains a larger size and is more 
ponderous; it also differs in color, being much 
lighter. It has not been reported south of the 
Potomac and Ohio Rivers, but extends from 
Pennsylvania to Iowa. 
2. LIOPL. CYCLOSTOMATIFORMIS, Lea. 
Plate 15, fig. 4.: 
Plate 18, fig. 4 (Paludina Eltiottii, Lea). 
Cylindrically-pupseform, moderately thick, 
surface marked by small growth lines, which 
are flexuous; whorls 5 to 7, well rounded, 
spire exserted, sutures deeply impressed, some- 
CBN 
