292 LAND AND FRESH- "WATER SHELLS OF N. A. [PART IV. 



Schuylkill Rivers. The basal portion of the labrum in Lister's figure 

 of plate 113, fig. 7, above quoted, is deficient, nevertheless I have no 

 doubt that the figure was intended for this species, and that his lower 

 figure on plate 109 is intended to represent the variety. — Say. 



The above description applies only to the smooth variety, 

 between which and multilineata, every grade occurs. Several 

 of these have been described by DeKay and Menke as distinct 

 species. "Were it not for these intermediate stages, and the 

 long continued observations upon this species, in consequence 

 of its favorable habitat, the two extremes would certainly be 

 considered distinct, as Say classed them. 



The following are the descriptions referred to. 



Melania multilineata. — Shell gradually tapering; apex generally 

 much eroded; whorls about seven, a little convex, with numerous, 

 J,, gg- filiform, elevated, subequal lines, which are from teti to 

 twenty in number on the body-whorl. 

 Habitat. — Tributaries to the Delaware. 

 Length, nineteen-twentieths ; greatest width, two-fifths 

 of an inch. 



Observations. — I found several specimens of this shell 

 in Frankford Creek, and Professor Vanuxem presented 

 me with others which he obtained from a creek in New 

 Jersey. The M. elevata (p. 95 of this work), from its 

 attributed specific characters, might be supposed to be nearly related 

 to this shell, but it difiers in being of a more accurate conic form, the 

 whorls being flattened, and not convex as in this species ; its raised 

 lines are also few in number. 



Synonyme. — M. curta, Menke, Synop., Mollusc, p. 81. — Say. 

 Melania curta. — Shell ovately oblong, subturreted ; apex cariously 

 truncated, transversely, sulcately striate, brownish-black ; aperture 

 oval ; lip produced in front. 



Habitat. — Philadelphia ; Bescke. 

 Longitude, 7 liu. ; latitude, 4 lin. — Menke. 



Melania fasciata. — Shell conically oblong, turreted ; apex eroded, 

 greenish, semipellucid, with a few obsolete sulci, last whorl doubly 

 brown-banded, the others with a.single band; lip marginal, rounded, 

 produced in front. 



Habitat. — Philadelphia ; Bescke. 

 Longitude, 11; latitude, 4 J lin. — Menke. 



