412 LAND AND FRESH-WATER SHELLS OF K. A. [PART IV. 



Diameter, -32 (8 niillim.); lenj^th, -50 of an inch (13 millim.). 

 Lonijt.h of aperture, '30 (9 millim ); breadth of aperture, -18 oi an 

 inch (4i millim.)- 



Observations. — Cannot be confounded with any other species; its 

 Fig. 820. remarJiably flat whorls rising like steps, but little above 

 ||^|;i;;;Tv each other, ^Yith a distinct and slightly raised rim around 

 the periphery, will alone be sufficient to characterize the 

 species. It seems more like an Anculosa in form, but is 

 nevertheless a true Melania. Two bands are visible on the body- 

 whorl and also within the aperture. — Anthony. 



There are, in Collection Smithsonian, several hundred speci- 

 mens of this shell from Green River, Kentucky. It is allied 

 to 2)rcerosa, but appears distinct in tlie plane spire. 



20. A. atnpla, Anthony. 



Anculosa nmpli, ANTHONY. Ann. N. Y. Lye. Nat. Hist., vi. p. 1.59, t. .5, f. 22, 23. 

 LeptoxiS ampla, Anthony, Cinnev, Cliecic List, No. 3:59. Brot, List, p. 23. 



Variety a. 



Aii'-tdosa elc.oans, Anthony, Proc Acad. Nat. Sci.. p. 09, Feb., 1860. 

 AncuMus (ict/aiu, Anthony, Reeve, INIonoj?. Anculotns, t. 0, f . 49. 

 Liptoxis eleyuns. Anthony, BiNNEV, Check List, No. 35G. Bkot, List, p. 24. 



Variety h. 



Anculosa formosa, LEA, Proc. Acad. Nat. Sci., p. 187, 18G0. Jour. Acad. Nat. Sci. 



V pt. .3. p. 2.54, March. 1SG3. Obs., ix. p. 7G. 

 Ltptoxis formosa, Lea, Binney, Check List, No. 358. Bkot, List, p. 24. 



Description. — Shell ovate-globose, olive-green, with four dark col- 

 ored bands; spire very short, eroded; whorls 2-3, the last one shoul- 

 dered, and peculiarly flattened just before Fig. 823. Fig. 822. Fig. 821 

 completion, and having the shoulder raised 

 into a few very slightly defined tubercles, 



which in some individuals are hardly per- ^^>' ^\^J ^Bt 

 ceptible ; suture deeply excavated; aper- 

 ture ovate, showing the dark bands of the exterior; columella 

 brown, excavated and flattened, without basal sinus, giving that 

 portion of the shell much resemblance to a LitLorina. 



Habitat.— A\-dX>a.ma.. 



Diameter, -42 (11 millim.); length, -02 of an inch (IG millim.). 

 Length of aperture, -42 (11 millim.); breadth of aperture, 35 oi an 

 inch (9 millim.). — Anthony. 



