40 THE NAUTILUS. 



G. laeta Jay. Wilsonville; Fort "William Shoals and Wetumpka, 

 common. G. hiuisii Lea and culta Lea are probably synonym?. 



G. neyata Lea. Wetumpka. 



G. nigrocincta Anth. Spring at Montevallo. 



G. nigrocincta Anth., var. quadricincta Lea. Tallassee. 



G. nigrocincta Anth., var. grata Anth. Montevallo. 



G. pyhasii Lea. Calera. 



G. nibicunda Lea. Wetumpka, common and variable. 



G. semicostata Con. Randolph Creek and Blount Springs. 



G. shoivalterii Lea. Fort William Shoals. The elongated oper- 

 culum of this species, unlike that of Anculosa rubiginosa^ shows a reg- 

 ular growth with the growth of the shell. 



G. symmetrica Hald. Buckschatchee Creek, Calera ; Randolph 

 Creek, Blount Springs. 



G. vanuxemiana Lea. Spring Creek ; Fort William Shoals, AVe- 

 tumpka and Wilsonville. 



G. vanuxemii Lea. Fort William Siioals. 



G. variata Lea. Montevallo, common. 



G. wheatleyii Lea. Spring Creek, Farmer and Fort William 

 Shoals. 



Schizostoma alabamaensis Lea. Wilsonville and Wetumpka. 



S. castaneum Lea. Coosa River, Wetumpka and vicinity. Mature 

 specimens were rare. Fissure deep and narrow ; three- or four- 

 banded, when four-banded the two middle ones are approximate. 

 The carina is obscure except at the tip of the young ; the spire of 

 mature specimens is eroded giving them a cylindrical shape. 



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

 Fort William Shoals, generally three-banded, smooth or inclined to 

 be nodulous below the hem ; differs from incisum by the fissure being 

 more direct and deeper, ground color lighter, the bands are more dis- 

 tinct. Incisum is never nodulous. ^S". amplum and salebrosum are 

 synonyms. 



S. ellipticum Anth. (syn. hdbosum Anth.). Wetumpka and Wil- 

 sonville. Several hundred specimens show considerable variation, 

 many are smooth, others more or less striate, some quite distinctly 

 nodulous, three-banded, the bands generally broad, giving the shell 

 a dark appearance. S. cylindraceum may be a form of this species. 

 S. glans Lea. Fort William Shoals, close to ellipticum if not a 

 synonym. 



