100 PROCEEDINGS OF THE ACADEMY OF 



9. A. dilatat 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, f 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. 2S. 

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

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



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

 Leptoxis carinata, Anthony, Binney, Check LLt, 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 ivftata, 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 rapceformis, Haldeman, Monog. Leptoxis, p. 4, t. 4, f. 123. Brot, 



List, p. 25. 



10. A. corp ulenta,J 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. m el an oi d es, 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, Supp'ement to No. 1, Monog. Lini- 



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. tr ilineata, 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. 



Anculosa trilineata, Say, DeKay, Moll. N. Y. s p. 300. Wheatley, Cat. Shells 

 U. S., p. 27. Jay, Cat. Shells, 3d Erlit., p. 62. 



Anculotus trilineatus, Say, Jay, Cat., 4th Edit., p. 276. Reeve, Monog. An- 

 culotus, t. 5, f. 41, b. 



Leptoxis trilineata, Say, Haldeman, Monog. Leptoxis, p. 5, t. 5, f. . Bin- 

 ney, Check List, No. 389. Brot, List, p. 26. 



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

 that protean species. , 



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

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

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



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



[April, 



