NATURAL SCIENCES OF PHILADELPHIA. 313 



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

 Melania, sp. 277. 



35. P. Currierianum, Lea. 



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



E. Plicate Pleuroceras. 



36. P. Sycamorense, Lea. 



Trypanosoma 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, Manuel, 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. 

 Trypanosoma 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. lat i v ittat um, Lea. 



Trypanosoma 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. 



Trypanosoma 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. 



Io 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 proye to be a variety of this species. 



t Juvenile shell. 



1 = Preceding? 



9 i J . lativittatum has a line below the angle of the periphery, which this species has not. 



1863.] 



