NATURAL SCIENCES OF PHILADELPHIA. 319 



Anculotus nuperus, Say, Reeve, Monog. Anc. t. 1, f. 5. 

 Litkasia nupera, Say, Binney, Check List, No. 302. 



Melanopsis semigranulosa, Deshayes, Encyc. Meth. Vers. ii. p. 438. Lam- 

 arck, Anim. Sans. Vert. 2d edit. vii. p. 491. 



Sub-genus LITHASIA, Haldeman. 



Lithasia, Haldeman, Supp. to Monog. Limniades, No. 1, Oct. 1840. Binney, 

 Check List, Feb. 1860. Lea, Proc. Acad. Nat. Sciences, p. 54, Feb., 

 1861. Lea, Jour. Acad. Nat. Sci. v, p. 258 and 354, Mar. 1863. Observa- 

 tions ix. p. 80 and 176. 



Lithasia, Haldeman, (part.), H. & A. Adams, Genera 1, p. 308, Feb. 1S54. 



Lithasia, Lea, 1845, Chenu, Man. Conchyl. i. p. 296, 1859. 



Megara {part.) Adams, Genera, i. p. 306, Feb. 1854. 



Anculotus (part.) Say, Gray, Genera, Zool. Proc. pt. 15, p. 153, 1847. Reeve, 

 Monog. Ancul., Apr., 1860. 



Anculosa and Melania (Sp.) Auct. 



SPECIES. 



A. Shell large, oval, inflated. 



1. L. fuliginosa, Lea. 



Melania fuliginosa, Lea, Philos. Proc. Philos. Trans, viii. p. 170, t. 5, f. 

 17. Obs. iii. p. 8. DeKay Moll. N. Y., p. 94. Troost, Cat. Wheatley, 

 Cat. Shells, U. S. p. 25. Binney, Check List, No. 113. Catlow, Conch. 

 Nomenc, p. 186. Brot. List, p. 40. Reeve, Monog. Melania, sp. 401. 



2. L. Florentiana, Lea. 



Melania Florentiana, Lea, Philos. Proc. Philos. Trans, viii. p. 188, t. 6, f. 

 53. Obs. iii. p. 26. DeKay, Moll. N. Y., p. 99. Wheatley, Cat. Shells 

 U. S., p. 25. Binney, Check List, No. 110. Catlow, Conch. Nomenc, 

 p. 186. Brot. List, p. 40. 



3. L. venusta,* Lea. 



Melania venusta, Lea, Philos. Proc. Philos. Trans, viii. p. 187, t. 6, f. 52. 

 Obs., iii. p. 25. DeKay, Moll. N. Y., p. 99. Jay, Cat. 4th Edit. p. 

 275. Troost, Cat. Wheatley, Cat. Shells U. S., p. 27. Binney, 

 Check List, No. 285. Catlow, Conch. Nomenc. p. 189. Brot. List, p. 

 40. Reeve, Monog. Mel., sp. 315. 



4. L. dilatata, Lea. 



Lithasia dilatata, Lea, Proc. A. N., S. p. 55, 1861. Jour. A. N. S., y. pt. 3, 

 p. 260, t. 35, f. 69. Obs. ix. p. 82. 



5. L. imperialis, Lea. 



Lithasia imperialis, Lea, Proc. A. N. S., p. 55, 1861. Jour. A. N. S v. pt. 

 3, p. 258, t. 35, f. 67. Obs. ix. p. 80. 



B. Shell small, compact oval-elliptical. 



6. L. vit at ta, Lea. 



Lithasia rittata, Lea, Proc. A. N. S., p. 273, 1862. Jour. A. N. S., v. pt. 3 

 p. 354, t. 35, f. 67. Obs. ix. p. 176. 



7. L. Showalterii, f Lea. 



Lithasia Showalterii, Lea, Proc. A. N. S., p. 188, 1850. Jour. A. N. S. v. pt. 



3, p. 262, t. 35, f. 72. Obs. ix. p. 84. 

 Melania Showalterii, Lea, Reeve, Monog. sp. 423. Brot, List. p. 33. 



* More cylindrical, lighter colored, and more ponderous, though not so large as L. Florentiana. 

 t More cylindrical than vittata, with the aperture wider, lip more curved, and the spine shorter 

 >.nd more rapidly accuminate. 



1863.] 



