Anculosa dentata, Lea, Philos Proc. ii. p. 34, Apr. 1841. 



Leptoxis dentata, Lea, Binney, Check List, No. 353. 



Anculosa (Mudalia) affinis^ Haldeman, Monog. Limniades, Cover of No. 3, 



Mar, 13th, 1841. 



Anculolus affinis, Haldeman, Reeve, .Monog. Anculotus, t. 6, f. 53. 

 Leptoxis affinis, Haldeman, Binney, Check List, No. 337. Brot, List, p. 23. 



9. A. d i 1 a t a t a,* Conrad. 



Melania dilatata, Conrad, New Fresh-Water Shells, Appendix, p. 6, t. 9, f. 5, 



1834. 



Anculotus dilatatus, Conrad, Reeve, Monog. Anculotus, t. 5, f. 38. 

 Anculosa dilatata, Conrad, Am. Journ. Science, n. s., i. p. 407. Hanley, 



Conch. Misc. t. 5, f. 38. 



Mudalia dilatata, Conrad, Chenu, Manuel de Conchyl. i. f. 2043 5. 

 Leptoxis dilatata, Conrad, Haldeman, Monog. Leptoxis, p. 4, t. 4, f. Ill 



120. Binney, Check List, No. 354. Brot, List, p. 24. 

 Melania Rogersii,^ Conrad, New Fresh- Water Shells, Appendix, p. 7, t. 9, 



f. 7, 1834. Jay, Cat., 4th Edit., p. 274. 



Anculotus Rogersii, Conrad, Reeve, Monog. Anculotus, t. 4, f. 28. 

 Leptoxis Rogersii, Conrad, Binney, Check List, No. 382. 

 Anculotus carinatus, Anthony, Bost. Journ. Nat. Hist., iii. pt. 3, p. 394, t. 3, 



f. 5, July, 1840. Reeve, Monog. Anculotus, t. 5, f. 42. 

 Leptoxis carinata, Anthony, Binney, Check List, No. 342. 

 Anculotus Kirtlandianus, Anthony, Bost. Journ. Nat. Hist., iii. pt. 3, p. 



295, t. 3, f. 4, July, 1840. Jay, Cat., 4th Edit., p. 276. Reeve, Monog. 



Anculotus, t. 4, f. 29. 



Anculosa Kirtlandiana , Haldeman, Wheatley, Cat. Shells U. S., p. 28. 

 Melania inflata, Lea, Philos. Trans, vi. p. 17, t. 23, f. 98. Obs. ii. p. 17. 



Wheatley, Cat. Shells U. S., p. 25. Binney, Check List, No. 147. 

 Leptoxis rapazformis, Haldeman, Monog. Leptoxis, p. 4, t. 4,f. 123. Brot, 



List, p. 25. 



10. A. corpulent a, % Anthony. 



Anculosa corpulenta, Anthony, Proc. Acad. Nat. Sci. p. 68, Feb. 1860. 

 Anculotus corpulentus, Anthony, Reeve, Monog. Anculotus, t. 1, f. 9. 

 Leptoxis corpulenta, Anthony, Binney, Check List, No. 348. Brot, List, 

 p. 24. 



11. A. melanoides, Conrad. 



Anculotus melanoides, Conrad. New Fresh-Water Shells, p. 64, t. 8, f. 19, 

 1834. DeKay, Moll. N. Y., p. 102. Wheatley, Cat. Shells U. S., p. 26, 

 Reeve, Monog. Anculotus, t. 6, f. 48. 



Leptoxis melanoides, Conrad, Haldeman, Monog. Leptoxis, p. 5, t. 5, f. 145, 

 146. Binney, Check List, No. 369. 



Anculosa {Mudalia) turgida, Haldeman, Supplement to No. 1, Monog. Lim- 

 niades, Oct. 1840. Wheatley, Cat. Shells U. S., p. 28. 



Leptoxis turgida, Haldeman, Monog. Leptoxis, p. 5, t. 5, f. 151. Binney, 

 Check List, No. 393. Brot, List, p. 26. 



5. Shell smooth, globose, or flattened above. 



12. A. trilineata, Say. 



Melania trilineata, Say, New Harmony Dissem., No. 18, p. 227, Sept. 9, 

 1829. Say's Reprint, p. 19, 1840. Binney's Edition, p. 144. Catlow, 

 Conch. Nomenc. p. 189. 



* I had at first united this to dissimilis, and I am yet doubtful whether it is really distinct from 

 that protean species. 



f Young of dilatata. In placing all these specific names together as synonyms, I am sustained 

 by the decisions of Mr. Lea, (Philos. Trans. Tiii. p. 171,) Haldeman, Monog. Leptoxis, and Anthony, 

 Proc. Bost. Soc. Nat. Hist. i. p. 5. 



J Most nearly allied to the heavy, obsoletely angulated form of dissimilis. 



