65 



Melatoma salebrosum, Anthony, Reeve, Monog. sp. 8 and 15. 



Gyrotoma robusta, Anthony, Proc. Acad. Nat. Sci., p. 67, Feb., 1860. Bin- 



ney, Check List, No. 332. Brot, List, p. 28. 

 Melatoma robuslum, Anthony, Reeve, Monog. sp, 14, a, b. 

 Melatoma rectum, Anthony, of Reeve, Monog. sp. 7, a. 



25. S. g 1 a n d u 1 a,*JLea. 



Schizostoma glandula, Lea, Proc. Acad. Nat. Sci., p. 187, 1860. Jour. Acad. 



Nat. Sci., v. pt. 3, t. 35, f. 53, Mar., 1863. Obs. ix. p. 71. 

 Gyrotoma glandula, Lea, Binney, Check List, No. 319. Brot, List, p. 27. 



26. S. incisum,f Lea. 



Anculosa (Schizostoma) incisa, Lea, Phifos. Proc., ii. p. 243, Dec., 1842. 



Philos. Trans, ix. p. . 



Schizostoma incisa, Lea, Wheatley, Cat. Shells, U. S. p. 28. Hanley, Conch. 



Misc. Melania, t. 5, f. 44, 45. 



Gyrotoma incisa, Lea, Binney, Check List, No. 323. Brot, List, p. 27. 

 Melatoma incisum, Lea, Reeve, Monog. sp. 4. 

 Melania incisa, Lea, Jay, Cat., 4th Edit-, p. 274. 

 Leptoxis incisa, Lea, Binney, Check List, No. 363. Haldeman, Monog. p. 2, 



t. 1, f. 2426. 

 Gyrotoma quadrata, Anthony, Proc. Acad. Nat. Sci., p. 65, Feb., 1860. 



Binney, Check List, No. 330. 



Melatoma quadratum, Anthony, Reeve, Monog. fig. 7, b, (not 7 a, or 8). 

 Schizostoma virens, Lea, Proc. Acad. Nat. Sci., p. 187, 1860. Jour. Acad. 



Nat. Sci., v. pt. 3, t. 35, f. 59. Obs. ix. p. 75. 



Gyrotoma virens, Lea, Binney, Check List, No. 335. Brot, List, p. 28. 

 Gyrotoma obliqua, Anthony, MSS. 



Species unknown to me. 

 Gyrotoma cornea, Shuttleworth, (ubi) Brot, List, p. 27. 



3d Section : aperture entire and rounded below. 

 Genus ANCULOSA, Say. 



Anculosa, Say, Jour. Acad. Nat. Sci., ii. p. 178, Nov. 1821. Conrad, Am. Jour. 

 Sci. xxv. p. 342, 1834. Muller, Syn. Test. Viv. p. 39, 1836. Swainson, 

 Manual Malacol. 1840. Haldeman, Suppl. to Monog. Limniades, Oct. 

 1840. Sowerby, Conch. Manual, Edit. 2, p. 66, 1842. Wheatley, Cat. 

 Shells U. S. p. 27, 1845. Lea, Philos. Trans, ix. p. 14, 1846. Anthony, 

 Proc. Acad. Nat. Sci. p. 67, Feb. 1860. 



Anculosa, Conrad, Hermannson Indices Gener. Malac. i. p. 51, 1846. 



Anculotus, Say, Jour. Acad. Nat. Sci.,v. pt. 1, p. 128, Aug. 1825. Conrad, New 

 Fresh Water Shells, p. 62, 1834. Couthuoy, Bost. Jour. ii. p. 184, Feb. 

 1839. Anthony, Bost. Jour., iii. p. 278, Jan. 1840. DeKay, Moll. N. York, 

 p. 101, 1843. Chenu, Bibl. Conch, i. iii. Conrad, p. 26, 1845. Gray, Ge- 

 nera, Zool. Proc. xv. p. 153, 1847. Woodward, Manual, i. p. 131, 1851. 

 Jay, Cat. 4th Edit., p. 276, 1852. Reeve, Conch. Iconica, Sept. 1860. 



Ancylotus, Say, Hermannson, Indices. Gen. Mai. i. p. 51, 1846. 



??Leptoxis, Rafinesque, Journ. de Phys. Ixxxviii. p. 424, 1819. Haldeman, Mo- 

 nog. Lept. H. & A. Adams, Genera, i. p. 307, Feb. 1854. Chenu, Man. 

 de Conchyl. i. p. 294, 1859. Binney, Check List, p. 10, June, 1860. Brot, 

 List, p. 23, 1862. 



Mudalia, Haldeman, Suppl. to Monog. Limn., Oct. 1840. 



Nitocris, H. & A. Adams, Genera, i. p. 308, Feb. 1854. 



* Closely allied to 8. incisum, but may be distinguished by being heavier, of different color, 

 higher spire, and more convex outline. 



t Mr. Lea, (Obs. ix. p. 67), considers quadratum, Anth., to be a synonym of his S. incisum, in 

 which decision I entirely agree with him. To these I unite S. virens, Lea, which I find to be the 

 young shell of the same species. 



