23 



Binney's Reprint, p. 65. Binney, Check List, No. 45. DeKay, Moll, 



N. Y., p. 94. Wheatley, Cat. Shells U. S., p. 24. Ravenol, Cat., p. 



11. Jay, Cat., 4lh Edit., p. 273. Anthony, List, 1st and 2d Edit 



Kirtland, Report Zool. Ohio, p. 174. Catlow, Conch. Nomenc, p. 185. 



Brot, List, p. 30. Reeve, Monog. Mel., sp. 304. 

 Ceriphasia canaliculata, Say, Chenu, Manuel, Conchyl. i. f. 1959. 

 Melania conica,* Say, Jour. Acad. Nat. Sci., ii. p. 176, January, 1821. Bin- 

 ney's Reprint, p. 70. Binney, Check List, No. 65. Reeve, Monog. 



Mel., sp. 252. DeKay, Moll., N. Y., p. 95. Ravenel, Cat., p. 11. 



Haldeman, Monog. Limniades, No. 7, p. 4 of Cover. Brot. List, p. 30. 



Kirtland, Rep. Zool. Ohio, p. 174. Anthony, List, 1st and 2d Edit. 



Jay, Cat., 4th Edit., p. 273. Wheatley, Cat. Shells U. S., p. 24. 



Catlow, Conch. Nomenc, p. 186. 

 Melania substricta,] Haldeman, Stippl. to Monog. of Limniades. 

 Strombus Sayi, Wood, Index Testaceol. Suppl., t. 4, f. 24. 

 Melania Saiji, Wood. Short and Eaton, Notices, p. 82. Anthony, List, 1st 



and 2d' Edit. 

 Melania Saiji, Ward. Wheatley, Cat. Shells U. S., p. 27. 

 Melania Sayii, Ward. Kirtland, Rept. Zool. Ohio, p. 174. Jay, Cat., 4th 



Edit., p. 274. Higgins, Cat., p. 7. 

 Melania Sayii, Deshayes, Catlow, Conch. Nomenc, p. 188. 

 Melania exarata, Menke, Syn. Meth., p. 135, 1830. Binney, Check List, 



No. 100. 

 Melania ligata, Menke, Syn. Metli., p. 136, 1830. Binney, Clieck List, No. 



162. 

 Melania auriscalpium, Menke, Syn. Meth., p. 136, 1830. Binney, Check 



List, No. 25. 



9. P. filum,t Lea, 



Melania Jilum, Lea, Philos. Proc, iv. p. 165. Philo». Trans., x. p. 62, t. 9, 

 f. 41. Obs., iv. p. 62. Binney, Check List, No. 109. Brot, List, p. 

 30. Reeve, Monog. Mel., sp. 402? 



Elimia Jilum, Lea, Chenu, Man. Conchyl. i. f. 1980. 



10. P. ponderosum,§ Anthony. 



Melania ponderosa, Anthony, Proc. Acad. Nat. Sci.. Feb., 1860, p. 59. Bin- 

 ney, Check List, No. 213. Brot, List, p. 59. 



Trypanostoma dux, Lea, Proc Acad. Nat. Sci., p. 170, 1862. Jour. Acad. 

 Nat. Sci., V. pt. 3, p. 283, t. 36, f. 105. Obs., ix. p. 105. 



11. P. olivaceum. Lea. 



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

 Acad. Nat. Sci., v. pt. 3, p. 290, t. 36, f. 117. Obs., ix. p. 112. 



12. P. Troostii,|| Lea. 



Trypanostoma Troostii, Lea, Proc Acad. Nat. Sci., p. 171, 1862. Jour. 



Acad. Nat. Sci., v. pt. 3, p. 285, t. 36, f. 107. Obs., ix. p. 107. 

 Trypanostoma viride,^ Lea,, Proc. Acad. Nat. Sci., p. 172. 1862. Jour. Acad. 



Nat. Sci., V. pt. 3, p. 291, t- 36, f. 119. Obs., ix. p. 113. 

 Trypanostoma liyatrnn,** Lea,, Proc. Acad. Nat. Sci., p. 171, 1862. Jour. 



Acad. Nat. Sci., v. pt. 3, p. 288, t. 36, f. 114. Obs., ix. p. 110. 



* Juvenile shell. 



t Proposed under the impression thatconica was preoccupied. 



j Distinguished from canaliciilatum by its more elevated spire, more prominent carina, and flat- 

 tened whorl8._ It almost entirely replaces canaliculatum in the waters of Tennessee, and if gpe- 

 cificially identical with that species, must at least be distinguished as a local variety. 



§ Appears to l)e doubtfully distinct from canaliculatum, excuratum, &e. It is doubtful, indeed, 

 whether the whole group contains more than one species. 



II More inflated and more convex than canaliculaUuii, with the inferior half of the body whorl 

 longer and more convex. 



% ** Young shells of Troostii in different stages of growth. 



