THE NAUTILUS. .41 



S. excisum Lea (syn. pumilum Lea). Wetumpka and vicinity. 

 Varies from cylindrical to globosely ovate, banded or without bands, 

 those without bands are mature and nearly all of them show a di-- 

 position to have bands on the first whorl. The cord-like elevation 

 behind the fissure is well developed on some while others show very 

 little or nothing of it. The stria? are generally distinct. The fissure 

 is direct, medium in length and width. 



S. ylandula Lea. Described from one specimen. The only 

 noticeable difference from incisum, of which it is a color variety, 

 is the light color and the bands more narrow and distinct. The 

 color and bands resemble constrictutn, but the fissure places it with 

 incisum. 



S. incisum Lea. The most plentiful species of this genus at 

 Wetumpka. The fissure is very short, wide and oblique, in some 

 cases only a sinuous outer lip. The three broad bands are clouded, 

 giving the shell a dark color. 



S. letpisii Lea. Coosa River, near Wilsonville, Ala. Two 

 specimens referred to this species may be only elongated forms of G. 

 irnpressa with a very sinuous outer lip. 



S. ovoideum Shutt. Wetumpka. 



S. pyramidatum Shutt. (syn. pagoda Lea, wetumpkaensis Lea, 

 babylonicutn Lea). 



Shell smooth, striate, or carinate, four-banded or without bands. 

 The carina, always prominent on the young, disappears with the 

 erosion of the spire. The fissure is short and constant in character. 

 Pagoda was described from three specimens. In his description of 

 ivetumpkaensis Mr. Lea says it is umblicate. I find this is not the 

 case with all the specimens and especially the young, nor is the 

 supposed umbilicus confined to wetumpkaensis. It 5s not a true 

 umbilicus but caused by erosion. S. babylonicnm was described from 

 one specimen and I think it only a mature form of that described as 

 wetumpkaensis. Showalterii and demissum may also be forms of 

 this species. 



Anculosa ampla Anth. There are not many specimens which I 

 refer to this species. The epidermis and character of the bands, 

 outline of body-whorl, and shape of aperture, differ from picta and 

 all its varieties. The columella of the specimens from Fort William 

 Shoals is always purple; it is white in a few specimens from Wet- 

 umpka and vicinity. 



