23 



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



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



11. Jay, Cat., 4th 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 cornea,* 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, Snppl. to Monog. of Limniades. 

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

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



and 2d Edit. 



Melania Sayi, 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, Catlovr, Conch. Nomenc., p. 188. 

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



No. 100. 

 Melania ligata, Menke, Syn. Meth., p. 136, 1830. Binney, Check List, No. 



162. 

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



List, No. 25. 



9. P. filum,t Lea, 



Melania filum, Lea., Philos. Proc., iv. p. 165. Philos. 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? 



Elimiafilum, Lea, Chenu, Man. Conchyl. i. f. 1980. 



10. P. po nde ros um, 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 oliraceum, 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 ligatum,** 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 ih&iconica, -was preoccupied. 



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

 tened whorls. It almost entirely replaces canaliculatum in the waters of Tennessee, and if ape- 

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



f Appears to be doubtfully distinct from canaliculatum, excuratum, 4c. It is doubtful, indeed, 

 whether the whole group contains more than one species. 



y More inflated and more convex than canaliculatum, with the inferior half of the body whorl 

 longer and more convex. 



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



