26 



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

 Melania, sp. 277. 



35. P. Currierianam, Lea. 



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



E. Plicate Pleuroceras. 



36. P. Sycamorense, Lea. 



Trypanostoma Scyamor^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. p 1 i c a t u m, Tryon. 



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



F. Smooth, Angulate PleurocercB. 



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. 



Cerip/iasia 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. gradatum, 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. a rat urn, 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. lat i vittatum. 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. 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. 



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



t Juvenile shell. 



X zz Preceding? 



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



