Anculosae of the Alakama River Drainage 



45 



The shells of adult animals differ greatly in size. Sulcate forms do 

 not gain the size of some that are only partially sulcate or are nearly or 

 wholly smooth. 



Measurement of shells: 



Altitude 

 13H mm. 



16 



14 

 10 



1654 

 15 



Diameter 



II mm. Coosa River, Schowalter collection 



11 Fort William Shoals, Talladega County 

 II 

 II 



12 Peckerwood " " 

 12 

 II " " 



Anculosa lirata H. H. Smith, new species 



Fig. 22 



Shell: Small, subglobose, in form much like a juvenile specimen of A. griffithiana 

 Lea. Body whorl subangular, slightly indented over the umbilicus. The type has 

 nine folds or ribs from suture to base, each of about the same size. The two upper- 

 most folds are somewhat wavy, though no other indication of plicae exists. The 

 longitudinal lines of growth are delicate, but distinct, being crossed by revolving lines ; 

 the sculpture having a silky appearance under the glass; this is particularly noticeable 

 in the spaces between the folds. Color dark brown, somewhat mottled. Aperture 

 ovate, having four continuous, equidistant bands. The columella is small, smooth, 

 rounded, purple at the top, white from just above the center to the base. Apex 

 eroded, only a part of the penultimate whorl remaining in addition to the body whorl. 

 Suture not deeply impressed. Lip slightly crenulate, having only a suggestion of the 

 furrows present in many individuals of A. showaltcrii Lea. The lip is not flaring. 



Operculum: Thin, dark or rusty brown, about one-half as wide as it is high. 

 Apex acute. Left margin curved, slightly thickened; right margin curved, thin, a 

 little torn. Basal margin injured, but probably broadly rounded in a perfect state. 

 The polar point is near the left margin. The spiral lines cannot be traced. The 

 operculum differs from the opercula of A. shon'aUcrii Lea and A. sulcata Smith in 

 being more nearly oval, more delicate. 



Measurements: Altitude, iiYz mm.; diameter, 7^^ mm. Aperture — altitude, 7 

 mm. ; diameter, 33^2 mm. 



Type locality: Coosa River, Fort William Shoals, Talladega County, Alabama. 

 Collected by Herbert H. Smith, June, 1913. 



Type in the Museum of Zoology, University of Michigan; paratypes in the Ala- 

 bama Museum of Natural History. 



The type lot of lirata consists of three shells only. The species seems. 

 to represent a variation of shozvalterii Lea, smaller, more conic, more de- 

 licate of sculpture. It differs also in the operculum. The shell suggests 

 a dwarfed sulcata Smith, but has a fewer number of folds and lacks the 

 shouldered effect of the body whorl of that species. Connecting fomis with 

 sulcata appear in material from Three Island Shoals, above the type locality. 

 From Wetumpka material in the Calkins collection. Mr. Smith has separat- 

 ed a shell very much like the type specimen of lirata and among Anculosae 



