NATURAL SCIENCES OF PHILADELPHIA. 315 



Trypanosoma Cliristyi, 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. labia turn,* Lea. 



Trypanosoma 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. 

 Trypanosoma 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. ne glee turn, 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. vestitum, 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. 



68. 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 tenebrocincta, 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. Chak as aha e n se , Lea. 



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

 Acad. Nat. Sci., v., pt. 3, p. 280, t. 36, f. 99. March, 1863. Ob3. ix. 

 p. 102. 



62. P. K n o x e n s e , 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 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 negle.ctum, 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. 



t Having seen author's types of vestitum , 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. 



1863.] 



