28 



Trypanostoma CTiristyi, Lesi, Proc. Acad. Nat. Sci., p. 173, 1862. Jour, 

 Acad. Nat. Sci., v. pt. 3, 272, t. 36, f. 83. Obs., ix. p. 94. 



55. P. labia turn,* Lea. 



Trypanostoma labiatum, Lea, Proc. Acad. Nat. Sci., p. 173, 1862. Jour. 



Acad. Nat. Sci., v. pt. 3, p. 272, t. 36, f. 84. Obs., ix. p. 94. 

 Trypanostoma pallidum, Lea, Proc. Acad. Nat. Sci., p. 174, 1862. Jour. 



Acad. Nat. Sci., v. pt. 3, p. 275, t. 36, f. 90. Obs., ix. p. 97. 



56. P. neglectum, Anthony. 



Melania neglecta, Anthony, Ann. Lye. N. Y., p. 128, t. 3,f. 29, March, 1854. 

 Binney, Check List, No. 173. Bret. List, p. 34. Currier, Shells of 

 Grand River Valley, Mich., 1859. Reeve, Monog. Melania, sp. 247. 



57. P. vestitum, Conrad. 



Melania vestlta, Conrad, New Fresh Water Shells, p. 57, t. 8, f. 12, 1834. 

 DeKay, Moll. N. Y., p. 101. Wheatley, Cat. Shells U. S., p. 27. Bin- 

 ney, Check List, No. 287. Brot. List, p. 31. Reeve, Monog. Melania, 

 gp. 322. 



Melcthia mucronata,] Lea, Proc. Acad. Nat. Sci., p. 119, 1861. 



Trypanostoma mucronatum, Lea, Jour. Acad. Nat. Sci., v. pt. 3, p. 277, t. 36, 

 f. 93. Obs., ix. p. 99. 



58. P. strigosum. Lea. 



Melania strii/osa, Lea, Philos. Proc, ii. p. 13, Feb., 1841. Philos. Trans., 

 viii. p. 175, t. 5, f. 24. Obs., iii. p. 131. DeKay, Moll., N. Y., p. 95. 

 Troost, Cat. Binney, Check List, No. 250. Wheatley, Cat. Shells U. 

 S., p. 27. Catlow, Conch. Nomenc, p. 188. Brot. List, p. 38. Reeve, 

 Monog. Melania, sp. 320. 



59. P. tenebrocinctum, Anthony. 



Melania tenehrocincta, Anthony, Proc. Acad. Nat. Sci., p. 58, Feb., 1860. 



Binney, Check List, No. 266. Brot. List, p. 31. Reeve, Monog. Melania, 



sp. 271. 

 Trypanostoma parvum, Lea, Proc. Acad. Nat. Sci., p. 174, 1862. Jour. 



Acad. Nat. Sci., v. pt. 3, p. 276, t. 36, f. 91. Obs., ix. p. 98. 



60. P. V a n u X e m i i , Lea. 



Trypanostoma Vanuxemii, Lea, Proc. Acad. Nat Sci., p. 175, 1862. Jour. 

 Acad. Nat. Sci., v. pt. 3, p. 280, t. 36, f. 98. Obs. ix. p. 102. 



61. P. Chakasahaense, Lea. 



Trypanostoma Chakasahaense, Lea, Proc. Acad. Nat. ScL p. 175, 1862. Jour. 

 Acad. Nat. Sci., v., pt. 3, p. 280, t. 36, f. 99. March, 1863. Obs. ix. 

 p. 102. 



62. P. Knoxense, Lea. 



Trypanostoma Knoxense, Lea, Proc. Acad. Nat. Sci., p. 175, 1862. Jour. 

 Acad. Nat. Sci., v. pt. 3, p. 281, t. 36, f. 101. Obs. ix., p. 103. 



63. P. altipetum, Anthony. 



Melania altipcta, Anthony, Ann. N. Y. Lye, vi. p. 87, t. 2, f. 5. Binney, 

 Check List, No. 442. Brot. List, p. 34. Reeve, Monog. Mel., sp. 280. 



64. P. hastatuna, Anthony. 



Melania hastuta, Anthony, Ann. N. Y. Lye,, vi. p. 85, t. 2, f. 3, March, 1854. 

 Binney, Check List, No. 136. Brot. List, p. 31. Reeve, Monog. Mel., sp. 

 394. 



* Larger than neglectum, Anth., also more convex, lighter in color and differing in the form of 

 the canal. The typical pallidum in Mr. Lea's collections appears distinct, but I have seen numer- 

 ous specimens collected in dififcrent parts of Ohio which connect the two species. 



t Having seen author's types of X'Cititiim, I have no doubt tliat mucronatum is the same species. 

 Mr. Lea's description refers to the shell when not fully grown; it is curious that in his description 

 he mentions six whorls, and in his " Remarks " he gives it eight, while his figure exhibits ten. 



