OF CONCnOLOGY. 49 



DESCRIPTIONS OF NEW SPECIES OF NORTH AMERICAN 

 LAND AND FRESH WATER SHELLS. 



BY AV. G. BINNEY. 



The following descriptions are pnblislied in advance of the 

 work on the North American Land and Fresh Water Shells, 

 being prepared for the Smithsonian Institution. Prof Henry 

 has kindly permitted the use of the figures engraved for that 

 work. 

 ViviPAHA INORNATA, Binney. — t. 7, f. 1. 



Description. — Shell minutely perforated, globose-conic, thin, 

 smooth, polished, lines of growth extremely delicate on the 

 body whirl, imperceptible above; color uniformly greenish or 

 pale olive, unadorned with any revolving lines ; the suture 

 impressed, spire short, conical ; apex acute, distinct, not trun- 

 cated, whirls regularly increasing, inflated, the last globose, 

 erpialling about two-thirds of the shelPs length ; aperture 

 oblique, rounded, large ; lip continuous in one plane ; peristome 

 thin, acute, continuous ; columellar extremity appressed to the 

 body whirl, almost entirely concealing a minute umbilicus ; 

 parietal wall of the aperture covered with a thin, shining, color- 

 less callus. 



Leno;th of axis 19 mill., breadth 17 mill. 

 Habitat.^ near Chopatilo, Mexico. 



It is after a very careful examination of the specimens brought 

 from Chopatilo, that I have decided to propose for them a 

 specific name. Having submitted them to several experienced 

 Conchologists, I find my decision approved by them. It can 

 be compared with no known American form. 



The smooth, polished surface, unbroken by revolving lines, 

 the pale olive color and acute apex, are the more prominent 

 features of it. 



About a dozen specimens were brought. On one is an obtuse, 

 ill-defined carina on the middle of the body whirl, 

 Melantho decampi, Currier. — t. 7, f. 2, 3. 



Description. — Shell ovate, oblong, imperforate, rather thick, 

 irregularly roughened by occasional coarse wrinkles of growth, 

 decussated by delicate revolving and longitudinal strise ; green- 

 ish olive, with revolving dark broad lines when young, darker 

 when old ; suture impressed, spire elevated, but truncated ; 

 remaining whirls, three, of which the two upper are flattened, 

 the lower sub-convex, with a median obtuse carina, reaching to 



