266 



ANCYLIN.E. 



Species of Ancylus. 



aduncus, Gould. 

 Baconii, Bourg. 

 Barileusis, Morlc. 

 Beaui, Bourg. 

 Caffer, Krauss. 

 calcareus, Deltay. 

 capuloides, Jan. 

 Charpentierianus, Bourg. 

 cornpressus, Nyst. 

 conceritricus, D'Orb. 

 costulatus, Kiist. 

 crassus, Hold. 

 culicoides, D'Orb. 

 Curningianus, Bourg. 

 cyclostorria, Bourg. 

 deperditus, Desm. 

 depressus, Haiti. 

 Deshayesianus, Bourg. 

 diaphanus, Hald. 

 Drouetianus, Bourg. 

 filosus, Conr. 

 fuscus, C. B. Adams. 

 gibbosus, Bourg. 

 Haldemanii, Bourg. 

 Havanensis, Pfeiff. 



irroratus, Guild. 

 marginatus, Eichiv. 

 Moreletii, Bourg. 

 Moricandi, D'Orb. 

 obliquus, Brod. and Sow. 

 obscurus, Hald. 

 obtusus, Morel. 

 Orbignyanus, Bourg. 

 parallelus, Hald. 

 Petitianus, Bourg. 

 pileolus, Ferns. 

 radiatilis, Morel. 

 radiatus, Guild. 

 Raymondii, Bourg. 

 riparius, Desm. 

 rivularis, Say. 

 Saulcyanus, Bourg. 

 simplex, Buchoz. 

 striatus, Webb and Berth. 

 strictus, Morel. 

 strigatus, Parr. 

 tardus, Say. 

 verruca, Bens. 

 vitraceus, Morel. 



Geuus acroloxus, Beck. 



Tongue armed with a central tooth, and twelve lateral 

 teeth on each side, then one tooth of a different form, and 

 lastly six more on each side. 



Shell dextral, elongated, ohlong, patelliform, non-spiral; 

 apex near the middle, directed to the left. 



Syn. Velletia, Gray. 



