THE NATURAL HISTORY SURVEY. 325 



Animal, Radula, etc.: As in the typical form. 



Distribution: As in the type. 



Remarks: This.variety does not seem to be as common as 

 the typical form. It is connected with elevatum by almost im- 

 perceptible degrees, and is simply a striate form, but is worthy 

 of varietal distinction. It is found in the southern and western 

 regions. , 



GENUS GONIOBASIS Lea, 1862. 



Elimia* H. & A. ADAMS, Genera, Vol. I, p. 300, 1854. 

 Goniobasis LEA, Proc. Phil. Acad. Sci., p. 262, 1862. 



Shell: Generally elongated, spire long and more or less 

 pointed; aperture produced in front, but not canaliculate or 

 notched. 



Animal: Resembling that^of Pleurocera; jaw and radula 

 same as in the last genus. 



Distribution: Entire United States. 



132. Goniobasis livescens Menke, pi. xxxv, fig. 7. 

 Melania livescens MENKE, Syn. Meth., p. 135, 1830. 

 Melania niagarensis LEA, Proc. Amer. Phil. Soc., Vol. II, p. 12, 1841. 

 Melania napella ANTHONY, Proc. Bost. Soc., Vol. Ill, p. 362, 1850. 

 Melania cuspidata ANTHONY, 1. c., p. 362, 1850. 

 Melania correcta BROT., List, p. 39. 

 Goniobasis milesti LEA, Proc. Phil. Acad., p. 154, 1863. 

 Goniobasis translucens ANTHONY, Amer. Journ. Conch., Vol. I, p. 36, 

 pi. i, figs. 1, 2, 1865. 



Shell: Varying from elongate to ovate, acuminate, fre- 

 quently turreted on the upper whorls; color varying from blu- 

 ish flesh to light corneous, sometimes greenish, and frequently 

 with two dark brown bands; apex sharp, rounded, turned down- 

 wards; surface shining, with no spiral lines save a carina which 

 encircles the center of all the whorls |but the last two, and is 

 obsolete in the more bulbous forms; lines of growth oblique, 

 wrinkled, crowded; satures well impressed; whorls seven to 

 nine, more or less rounded, regularly and rapidly increasing in 

 size, the upper whorls carinated; spire elevated, either sharp- 

 conic or obtuse-conic; aperture large, ovate or subrhomboidal, 

 produced at the lower part, brownish-purple to purple inside; 

 peristome sharp, thin on the edge, but thickened by a callosity 

 within the outer lip, more or less sinuate; columella thick, solid, 



*In the first pages of this work the writer used Elimia for this well-known group of mol- 

 lusks, following Mr. Pilsbry's suggestion (Proc. Phil. Acad., p. 496; 1896); after these pages 

 were in print Mr. Pilsbry. in a letter, again suggested that it was very probable that Elimia 

 would not stand after all, being but a heterogeneous assembly of different forms, in the 

 presence of Lea's excellent and well-characterized diagnosis. 



