No. 216. Brot, List, p. 33. Catlow, Conch. Nomenc., p. 188. DeKay 



Moll. N. Y., p. 98. Reeve, Monog. Melania, sp. 403, 

 Melania incrassata, Anthony, Ann. Lye. N. Y., vi. p. 99, t. 2. f. 17, March, 



1854. Binney, Check List, No. 144. Brot. List, p. 34. 

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



Acad. Nat. Sci., v. pt. 3, p. 270, t. 36, f. 80. Obs. ix. p. 92. 

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



Nat. Sci., v. pt. 3, p. 270, t. 36, f. 81. Obs., ix. p. 92. 



26. P. t o r t u m, Lea. 



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

 Nat. Sci., v. pt. 3, p. 275, t. 36, f. 89. Obs., ix. p. 97. 



27. P. dignum, Lea. 



Trypanostoma dignum, Lea, Proc. Acad. Nat. Sci., p. 273| 1862. Jour. Acad. 

 Nat. Sci., v. pt. 3, p. 350, t. 39, f. 219. Obs., ix. p. 172. 



D. Carinate, striate Pleurocerce* 



28. P. bi cos tat urn, Anthony. 



Melania bicostata, Anthony, Proc. Acad. Nat. Sci., p. 56, February, 1860. 



Binney, Check List, No. 33. Brot. List, p. 30. Reeve, Monog. Melania, 



sp. 246. 

 Melania rigida,* Anthony, Proc. Acad. Nat. Sci., p. 62, February, 1860. 



Binney, Cheek List, No. 229. Reeve, Monog. Melania, sp. 270. 



29. P. subulare, Lea, 



Melania subularis, Lea, Philos. Trans., iv. p. 100, t. 15, f. 30. Obs., i. p. 

 110, t. 15, f. 30. Ravenel, Cat., p. 11. DeKay, Moll. N. Y., p. 92, t. 

 7, f. 138. Wheatley, Cat. Shells U. S., p. 27. Jay, Cat., 4th Edit., 

 p. 275. Binney, Check List, No. 257. Brot, List, p. 35. Reeve, 

 Monog. Melania, sp. 428. Whiteaves, Canad. Naturalist, viii. p. 102, 

 April, 1863. 



30. P. subulseforme, Lea. 



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

 Acad. Nat. Sci., v. pt. 3, p. 289, t. 36, f. 116. Obs., ix. p. 111. 



31. P. Henryanum,* Lea, 



Trypanostoma Henryanum, Lea, Proc. Acad. Nat. Sci., p. 272, 1862. Jour. 

 Acad. Nat. Sci., v. pt. 3, p. 351, t. 39, f. 222. Obs., ix. p. 173. 



32. P. Lewisii,f Lea. 



Trypanostoma Lewisii, Lea, Proc. Acad. Nat. Sci., p. 172, 1862. Jour. Aead. 

 Nat. Sci., v. pt. 3, p. 292, t. 36, f. 120. Obs., ix. p. 114. 



33. P. annuliferum, Conrad. 



Melania annulifera, Conrad, New Fresh Water Shells, p. 51, t. 8, f. 2, 1834. 

 Jay, Cat., 4th Edit., p. 272. Binney, Check List, No. 17. DeKay, 

 Moll. N. Y., p. 94. Wheatley, Cat. Shells U. S., p. 24. Brot. List, p. 

 30. Catlow, Conch. Nomenc., p. 185. Reeve,* Monog. Melania, sp. 308. 



Melania annulata, Conrad, Jay, Cat., 2d Edit., p. 455. 



Melania Ordiana, Lea, Philos. Proc., ii. p. 242, Dec., 1842. Philos. Trans, 

 ix. p. 26. Obs., iv. p. 26. Wheatley, Cat. Shells U. S., p. 26. Bin- 

 ney, Check List, No. 191. Brot, List, p. 30. 



34. P. Brumbyi, Lea. 



Melania Brumbyi, Lea, Philos. Trans., x. p. 298, t. 30, f. 5. Obs., v. p. 



* Juvenile shell, 



t Probably the young of subulxforme. 



: This may only be a striate form ofekvatum, Say. 



Mr. Reeve's figure represents the variety described by Mr. Lea as Md. Ordiana. 



