410 LAND AND FRESII-WATEK SHELLS OF N. A. [PART IV. 



JlabUat.— 'LehOinon, Wilson County, Tennessee. 

 Diameter, -34 ; length, -53 of an inch. 



Observations. — I have three specimens before me from Mr. Safford ; 

 two of them are purple within and one white. None of them are 

 p. g,^ perfect on the apex, but I presume that the number of 

 whorls must be five. One of the specimens has four. In 

 outline it is very much like M. inflata (nobis), but it differs 

 totally in the form of the columella. In that species the 

 columella is twisted backwards, and makes an angular, 

 oblique channel; in the pinguis it is regularly curved, with scarcely 

 a perceptible indentation in place of a channel. The aperture is 

 fully one-half the length of the shell. — Lea. 



This shell is certainly an Anculosa., and is intermediate in 

 its characters between viridula, Anthony, and Kirtlandiana, 

 Lea. When well cleaned it frequently exhibits a greenish hue. 

 It is rather a common species, and somewhat variable in its 

 proportions, being sometimes prolate and in other specimens 

 from the same locality oblate. Mr. Lea's figure is copied. 



17. A. contorta, Lea. 



Anculosa contorta, Lea, Proc. Acad. Nat. Sci., p. 187, 1860. Jour. Acad. Nat. Sci., 



V, pt. :i, 1). '25S, t. 35, f. CO, March, I8J;5. Obs., ix, p. 80. 

 Leptoxis contorta, Lea, Binney, Check List, No. 347. Brot, List, p. 24. 



Description. — Shell smooth, ovately rounded, thick, yellowish liorn- 

 color; spire raised; sutures deeply impressed; whorls inflated, ob- 

 scurely and transversely striate ; aperture small, nearly round, 

 constricted, yellowish-white within ; columella thickened ; outer lip 

 acute and expanded. 



Habitat. — Coosa River, at Wetumpka, Alabama. 



Diameter, -30 ; length, -50 of an inch. 



Observations. — A single specimen only was received from Dr. 

 Showalter, which, being much eroded at the apex, prevents Fig. 818. 

 a perfect description being made. But the number of whorls 

 appears to be about four. The form is remarkable for an 

 Anculosa, the outline presenting the appearance of a Palu- 

 dina; but the callus on the columella and its whole massiveness 

 forbid its being placed in that genus, while the regular rotundity 

 of the whorls is similar in some measure to it. The aperture is 

 about half the length of the shell. — Lea. 



