GONIOBASIS. 249 



colored; spire short; sutures linear; wliorls rather flat; aperture 

 rather large, elliptical, -witliin purple. 



Habitat. — Falls of Niagara. 



Diameter, -25; length, -55 of an inch. 



Observations. — I oljtained this shell many years since at the foot 

 of the Falls of Niagara, where it exists in abundance. It -^j^ ^g^ 

 may generally have been confounded witli 31. depygis, Say. M^ 

 When I procured it I placed it in my cabinet under that M^ 

 name with a mark of doubt. It is a smaller shell than the \|H||\ 

 depytjis, has a shorter spire and a narrower aperture. Tliis ^^15/ 

 species has a purple columella and interior, which in some cases are 

 very darlc. The specimens procured were all more or less eroded, 

 and the apex removed. The number of whorls is either six or seven. 

 The aperture is nearly half the length of the shell. — Lea. 



Melania napella. — Shell small, ovate, acumiuate, smooth, light cor- 

 Fig. 485. neous; whoi'ls seven, the upper ones conical and carinate at 

 the sutures ; aperture one-half the length of the shell, nar- 

 rowly lunate ; lip dilated in front, sinuate posteriorly. 

 Longitude, h. ; latitude, i poll. 



Habitat. — Ohio. 



Observations. — A pale, rather singular species, from its bulbous 

 form. Some immature specimens of M. simplex are often much like 

 it. — Anthony. 



Melania cuspidata. — Shell small, short, ovate, acuminate, smooth, 

 greenish-purple, lighter on the sutures ; whorls six, convex, some- 

 times llatteued, apical ones carinate, the last ventricose ; ^. 



r\g. 48G. 



aperture large and equalling half the length of the shell ; 

 lip dilated in front, posteriorly scarcely sinuate. 



Habitat. — Mauraee Kiver, Ohio. 



Longitude, three-fifths ; latitude, three-tenths poll. 



Observations. — Allied to 3L napella, having the same 

 peculiar bulbous form and produced lip. It is, however, much more 

 elongated. It resembles 31. Warderiana, Lea. — Anthony. 



The identity of these species has long been conceded by 

 most of our best conchologists. They all possess in common 

 the short, Inilbous form and conical spire, frequently slightly 

 carinate ; and are readily known by the very convex, outer 

 lip, salmon-purple interior and dark purple-tinged columella. 

 The epidermis is corneous in fresh specimens, but most of 



