388 LAND AND FRESU-WATER SHELLS OF N. A. [PART IV. 



tuse angle below, and one above. One of the two specimens, under 

 examination, is more banded, and has a less number of stria? than 

 the other. The aperture is nearly three-fourths the length of the 

 shell. — Lea. 



Prof. Haldeman figured this last shell in his Monograph as 

 a variet}', but an examination of thousands of specimens from 

 Coosa River, Alabama, proves the entire identity of the two 

 forms by intermediate ones. Perhaps not one specimen in 

 one hundred is entirely smooth, ,and some are almost costate. 

 The columella is always tinged with purple, and the substance 

 of the shell generally slightly so. It appears to be a very 

 abundant and ver}' distinct species. Among the Coosa River 

 specimens several occurred with the top of the body-whorl 

 plicate. 



Mr. Reeve is in error when he says at sp. 47 that sp. 12 

 does not represent this shell, they equally represent it ; also 

 in quoting A. ampla, Anthony, as a synonyme of rubiginosa, 

 and Melania compacta, Anthony, as a synonyme of A. Grif- 

 Jithiana. 



4. Angulated species. 

 7. A. carinata, Bruguiere. 



Bulimus carinatus, Brug., Ency. Meth., vers, i, p. 301, 1702. 



Paludina dissimilis, Say, Nicholson's Encyc, 3d Ain. edit., 1819. 



Anculotus dissimilis, Say, Ravenel, Cat., y. 11. Jay, Cat., 4tli edit., p. 27C. REEVE, 



Monog. Ancul. t. 4, f. 27. 

 Anculosa dissimilis, Say, Wheatley', Cat. Shells U. S., p. 28. Haldeman, iu Rup- 



pell's Lancaster County, p. 479. 

 Nitocris dissimilis, Say, Adams, Genera, i, p. 308. 

 Leptoxis dissimilis, Say, Haldeman, Monog. Lept., p. 4, t. 4, f. 8,5-100. Brot, List, 



p. 24. BiNNEY, Check List, No. 355. Ciienu, Manuel, i, f. 2049-54. 

 Helix subcarinata, AVoOD, Index, Test. Suppl., t. 7, f. 13. Lister, t. Ill, f. 5. 

 Anculotus carinatus, DeKay', Moll. N. Y., p. 101, 1843. Jay', Cat., 4th edit., p. 276. 

 Ancxdosa carinata, DeKay, Wheatley, Cat. Shells U. S., p. 28. 

 Leptoxis carinata, DeKay, Binney, Check List, No. 343. Brot, List, p. 24. 



Variety a. 



Anculosa carinata, Lea, Proc, Philos., ii, p. 34, April, 1841. Philos. Trans., ix, 



p. 15. Obs., iv, p. 15. 

 Leptoxis carinata, Lea, BiNNET, Check List, No. 344. 

 Nitocris carinata, "Lea, Adam.s, Genera, i, p. 308. 

 Anculosa variabilis, Lea, Pliilos. Proc, ii, p. 34, April, 1841. Philos. Trans., ix, 



p. 15. Obs., iv, p. 15. Wheatley, Cat. Shells U. S., p. 28. 

 Leptoxis variabilis. Lea, Chenu, Manuel, f. 2037-.39. Binney, Check List, No. 394. 



