I20 Bryant Wai,ke;r 



Ferrissia tarda (Say). 



Ancylus tardus Walker, Naut., XVIII, 1904, p. 27, pi. I, figs. 11-12, 16-23; 

 pi. II, figs. 1-23. 



FiiRRiSsiA WALKERi ( Pilsbry and Ferriss). 



Ancylus walkeri Pilsbry and Ferriss, Pr. A. N. S. P., 1906, p. 564, fig. 5. 

 Type locality : Rogers, Benton Co., Ark. 



Subgenus L^VAPEX Walker, 1903. 

 Fi;rrissia DiAPHANA (Ilaldeman). 

 Ancylus diaphamis Walker, Naut., XVII, 1903, p. 17, pi. II, figs. 13-18. 



Ferrissia EXCENTRiCA (Morelet). 



Ancylus excentricus Morelet, Test. Noviss., II, 1851, p. 17; Pilsbry, Naut., 

 Ill, 1889, p. 64, pi. I, fig. 4; Walker, Naut., XVII, 1903, p. 27, pi. I, 

 figs. 19-21. 



Type locality: Lago de Ita, Peten, Guatemala. Also Comal Creek, New 

 Braunfels and Barton Creek, Travis Co., Texas. 



Ferrissia fusca (C. B. Adams). 



Ancylus fuscus Walker, Naut., XVII, 1903, p. 15, pi. I, fig. 1-9. 



Ferrissia FuscA EUGRAPTA (Pilsbry). 



Ancylus eugraptus Pilsbry, Naut., IX, 1896, p. 139. 



Ancylus fuscus eugraptus Walker, Naut., XVII, 1903, p. 17, pi. I, figs. 13-18. 



Type locality : Illinois River, Havana, Ills. 



Ferrissia hEmisph^rica (iWalker). 



Ancylus hemisphccricus Walker, Naut., XXI, 1908, p. 140, pi. 9, figs. 14-16. 

 Type locality: Georgia. Also Decatur, Ala. 



Ferrissia kirkeandi (Walker). 



Ancylus kirklandi Walker, Naut., XVII, 1903, p. 29, pi. II, figs. 1-12. 



Type locality : Grand Rapids, Mich. 



Ferrissia oescura (Haldeman). 



See Walker (Naut., XVII, 1903, p. 25, pi. I, figs. 16-18) for the Floridan 

 form doubtfully referred to this. Rediscovered in the south fork of the 

 Powell River at Big Stone Gap, Wise Co., Va., by Goodrich (48, p. 92), and 

 quite difi'erent from the supposed Florida examples. 



