26 



54. Binney, Check List, No. 40. Brot. List, p. 30. Reeve, Monog. 

 Melania, sp. 277. 



35. P. Currieriannm, Lea. 



Trypanostoma Currierianum, Lea, Proc. Acad. Nat. Sci., p. 155, May, 1863. 



E. Plicate Pleuroceras. 



36. P. S yearn ore nse, Lea. 



Trypanostoma Scyamore"nse, Proc. Acad. Nat. Sci., p. 175, 1862. Jour. Acad. 

 Nat. Sci., v. pt. 3, p. 283, t. 36, f. 104. Obs., ix. p. 105. 



37. P. plicatum, Tryon. 



Pleurocera plicatum, Tryon, Proc. Acad. Nat. Sci., Oct., 1863. 







F. Smooth, Angulate Pleurocerce. 



38. P. elevatum,* Say. 



Melania elevata, Say, Jour. Acad. Nat. Sci., ii. p. 176, Jan'y, 1821. Bin- 

 ney, Reprint, p. 70. Binney, Check List, No. 97. Jay, Cat., 4th Edit., 

 p. 273. Lapham, Cat. Moll. Wisconsin, p. 368. DeKay, Moll. N. Y., 

 p. 96. Wheatley, Cat. Shells U. S., p. 25. Catlow, Conch. Nomenc., 

 p. 186. Brot. List, p. 30. Reeve, Monog. Melania, sp. 442. 



Ceriphasia elevata, Say, Chenu, Manuel, i. f. 1961. 



Melania elongata, Lea, Philos. Trans., iv. p. 121, t. 15, f. 29. Obs., i. p. 

 130. Troost, Cat. Binney, Check List, No. 99. Wheatley, Cat. Shells 

 U. S., p. 25. Brot, List, p. 30. 



Ceriphasia elongata, Lea, Chenu, Manual, i. f. 1959. 



39. P. gr ad a turn, Anthony. 



Melania gradata, Anthony, Ann. Lye. N. Y., vi. p. 112, t. 3, f. 12, March, 



1854. Binney, Check List, No. 130. Brot. List, p. 30. Reeve, Monog. 



Melania, sp. 261. 

 Melania eximia,\ Anthony, Ann. Lye. N. Y., vi. p. 107, t. 3, f. 7, March, 



1854. Binney, Check List, No. 106. Brot. List, p. 58. Reeve, Monog. 



Melania, sp. 408. 

 Trypanostoma curtatum, Lea, Proc. Acad. Nat. Sci., p. 155, May, 1863. 



40. P. aratum, Lea.f 



Melania aratum, Lea, Philos. Proc., ii. p. 242, Dec., 1842. Philos. Trans., 



ix. p. 24. Obs., iv. p. 24. DeKay, Moll. N. Y., p, 98. Brot, List, 



p. 30. 

 Melania exarata, Lea, Philos. Proc. ii. p. 14, Feb., 1841. Philos. Trans., 



viii. p. 183, t. 6, f. 44. Obs., iii. p. 21. Troost, Cat. Binuey, Check 



List, No. 101. Catlow, Conch. Nomenc., p. 186. 



41. P. lativittatum, Lea. 



Trypanostoma lativittatum, Lea, Proc. Acad. Nat. Sci., p. 273, 1862. Jour. 

 Acad. Nat. Sci., v. pt. 3, p. 352, t. 39, f. 223. Obs., ix. p. 174. 



41, a. P. strict urn, Lea. 



Trypanostoma strictum, Lea, Proc. Acad. Nat. Sci., p. 272, 1862. Jour. 

 Acad. Nat. Sci., v. pt. 3, p. 352, t. 39, f. 224. Obs., ix. p. 174. 



42. P. m o d e s t u m, Lea. 



lo modesta, Lea, Proc. Acad. Nat. Sci., p. 394, 1861. Jour. Acad. Nat. Sci., 

 v. pt. 3, p. 348, t. 39, f. 216. Obs., ix. p. 170. 



* Ltwisii may prove to be a variety of this species. 



t Juvenile shell. 



I = Preceding ? 



P. lativittatum, has a line below the angle of the periphery, which this species has not. 



