28 



Trypanostoma Christyi, Lea, 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. la Ma turn,* Lea. 



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



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. Brot. List, p. 34. Currier, Shells of 

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



57. P. vest it urn, Conrad. 



Melania vestita, 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, 

 sp. 322. 



Melania 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 strigosa, 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 tenebrodncta, 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. Vanuxemii, 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. Sci. 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. a 1 1 i p e t u m , Anthony. 



Melania altipeta, 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. hastatum, Anthony. 



Melania hastata, 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 different parts of Ohio which connect the two species. 



f Having seen author's types of vcstitum, I have no doubt that 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. 



