AGARDHIA. 133 



Flach's figures of P. diezi are reproduced in pi. 19, figs- 17, 

 18. A specimen of A. retusa. from the Hydrobienschichten, 

 Wiesbaden, is drawn in pi. 19, fig. 16. 



Flach's definition requires modification to provide for A. 

 retusa, in which a parietal lamella is sometimes represented 

 by a low, oblong tubercle. 



6. Agardhia diezi (Flach). Coryna diezi Flach, Verhandl. 

 d. phys.-med. Ges. Whrzburg, n. F., XXIV, 1890, p. 49, pi- 3, 

 fig. 1. Lower Miocene, Burdigalien : Landschneckenkalk, 

 Tuchorschitz. 



7. Agardhia retusa (Sandb.). Pupa retusa (Al. Braun in 

 Walchner, Handbuch d. Geognosie, 2d. edit.., p. 1136, worn. 

 nud-l) Sandberger, Die Conchylien d. Mainzer Tertiarbeckens 

 1859, p. 53, pi. 5, figs. 12-12c. — Coryna retusa Boettger, Jahrb. 

 Nassau. Ver. f. Naturkunde, Wiesbaden, XLII, 1889, pp. 242, 

 320. — Pupa anodonta Braun, Sandberger, Vorwelt, 1875, pi. 

 25. Lower Miocene, Aquitanien : Hydrobienschichten, Mainz, 

 Budenheim bei Mainz. 



8. Agardhia reperta Wenz, Fossilium Catalogus Pt. 20, III, 

 1923, p. 1039, n. n. for Pupa aperta Sandberger, Neues Jahrb. 

 f. Min., Geol. u. Pal., 1895, I, p. 216 (not Pupa aperta v. 

 Martens, 1863; not Pupa aperta Sandb. ms., Miller, see Vol. 

 XXV, p. 219. — Agardhia aperta (Sandberger), Gottschick u. 

 Wenz, Archiv f. Molluskenkunde, 1921, p. 212, fig. 1. Upper 

 Miocene, Sarmatien : Steinheim am Albuch, Wiirttemberg. 



Key to Recent Species of Agardhia. 



( Aperture without palatal folds but sometimes a lip- 

 I tooth present. (Section Agardiella) (8). 

 j 2 to 4 more or less immersed palatal folds present. (Sec- 

 tion Agardhia proper) (2). 



Outer lip distinctly toothed within (3). 

 Outer lip not toothed, though more or less thickened 

 within (7). 



Peristome free, the parietal callus being built forward 

 (4). 

 j Parietal wall of the peristome adnate, thin or thickened ; 

 surface smoothish or very lightly striate (6). 



