PLEUROCERA. 85 



suture to be more impressed. The columella is more than usually- 

 twisted, whence the name of the species. Two of the specimens are 

 of a dull brown within, but have a whitish margin. The aperture is 

 rather more than the third of the leusth of the shell. — Lea, 



27. P. dignum, Lka. 



Trypanostovm dignum. Lea, Proc. Acad. Nat. Sei., p. 273, 18G2. Jour. Acad. Xat. 

 Sci., V, pt. 3, p. 350, t, 39, f. 219. Ob»., ix, p. 172. 



Description. — Shell slightly noduled, subfusiforra, somewhat thick, 

 honey-j'cllow, single-banded spire raised, regularly conical; sutures 

 impressed; whorls about eight, flattened, the last rather 

 large ; aperture ovately rhombic, salmon or wliite within, 

 single-banded within ; outer lip acute, sinuous ; columella 

 bent in, twisted, obtusely angular at the base. jfTf'! 



Habitat. — Yellowleaf Creek, Shelby County, Alabama; ^1^ 

 E. R. Showalter, M. D, 



Diameter, '52; length, 106 inches. 



Observations. — I have two specimens of this beautiful 

 species before me. The smaller has a well-defined row of small tuber- 

 cles on the middle of the whorls. The larger has an ill-deflued, ob- 

 scure row, which is partly made up by a raised line. Below this is a 

 well-marked capillary, brown band, which is distinct outside and in. 

 The clear, bright, smooth epidermis is of a honey-yellow, incliuiug to 

 brown. In outliuc it is near to Melania (Goniobasis) Vanuxemiana 

 (nobis), but it cannot be confounded with that species. The aperture 

 is more than one-third the length of the shelL — Lea. 



D. Carinate, stnate PleurocercB. 

 28. P. unciale, Haldeman. 



Mdania vnciah's, IlALD., Monog. Limniades, No. 4. p. 3 of Cover. Out. 5, 18H. .Tay, 



Cat..4tli edit., p.275. BiNNEY, Check List, Xp. 279. Bkot, List, p. 37. Keeve, 



Monof;. Mel., sp. 4.35. 

 Melania obliln. Lea, Philos. Trans., x, p. 208, t. 30, f. C. Obs., v, p. 54. Bixney, 



Check List, No. 182. Bhot. Li.'^t, p. 30. 

 Melania hicostata, Anthony, Proc. Acad. Nat. Sci., p. 50, February, 1800. Binxet, 



Check Li.st, No. 33. BisoT. List, p. 30. Ueeve, Mouoj,'. Melania. sp. 24'!. 

 Mehinin rir/ida, Anthony, Proc. Acad. Nat. .Sci., p. 02. February, 1800. BiNXEY, 



Check Li-^t, No. 220. Reeve. Monng. Melania, .«]). 270. 

 Melania siigillata, Reeve, Monog. Mel., sj). 319, September, 18G0. BnOT, List, p. 31. 



