I20 Brvant Walkkr 



Ferrissia tarda (Say). 



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

 pi. II, figs. 1-23. 



Ferrissia waekEri (Pilsbry and Fe-rriss). 



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. 

 Ferrissia diapiiana (Haldeman). 

 Ancylus diaphanus 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 : Fago de Ita, Peten, Guatemala. Also Comal Creek, New 

 Braunfels and Barton Creek, Travis Co., Texas. 



Ferrissia fusca (C. B. Adams). 



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



Ferrissia fusca eugrapta (Pilsbry), 



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



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



Type locality : Illinois River, Havana, Ills. 



Ferrissia HEMisPH^RiCA (Walker). 



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

 Type locality : Georgia. Also Decatur, Ala. 



Ferrissia kirklandi (Walker). 



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

 Type locality : Grand Rapids, Micb. 



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 difl^erent from the supposed Florida examples. 



