26 



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

 Melania, sp. 277. 



35. P. Currierianum, Lea. 



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



E. Plicate Pleuroceras. 



36. P. Sycamorense, Lea. 



Trypanostoma Scyamorfnse, 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. pi i cat urn, 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.J 



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. Binney, 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. strictum, 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. mode stum, 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. 



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



t Juvenile shell. 



1 = Preceding? 



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



