DAUDEBARDTA. 13 



D. LETOURNEUXI, Bourg. PI. 2, figs. 82-84. 



Shell very minute, much elevated, umbilicated, vitriniform, 

 shining, hyaline ; above narrowly radiately striulate, below 

 smooth ; whorls 2-J, rapidly increasing, with well-impressed 

 sutures, the last large, oblique, convex below. 



L. 2-25, alt. 1-25 milL 



Bona, Algiers. 



Immediately recognized by its small size and Yitrina-like 

 aspect. 



D. NUBIGENA, Bourg. PL 2, figs. 85-81. 



Shell umbilicated, much depressed, whorls 3, slightly convex, 

 with strongly impressed sutures, undulatingly striate above ; aper- 

 ture narrowly oval, the margins joined by a thin callus. 



Length, 5 mill. 



Algiers. 

 D. NIVALIS, Benoit. PL 2, figs. 11, 12. 



Shell umbilicated, subdepressed, vitreous, hyaline, diaphanous, 

 very fragile, substriate near the suture ; greenish horn-color ; 



aperture ovately lunate, oblique. Diam. maj., 4 mill. 



Sicily. 

 Resembles a Hyalinia in appearance. 



D. GRANDIS, Benoit. PL 26, fig. 2. 



Shell with deep umbilicus, convex, nearly smooth, shining, 

 broadly oval, nearly rounded, whorls 3, suture well-marked, 

 aperture large, rounded-oval, peristome subcontinuous. 



Length, 8 mill. 



Palermo. 



Has not the auriculate form of D. brevipes, and the aperture is 

 broader and spire more convex than Z>. rufa. 



D. MONTICOLA, Benoit. PL 26, fig. 1. 



Shell minute, umbilicated, shining, transparent, aperture 

 rounded-ovate, L. 3 mill., diam. 1*5 mill. 



Mt. St. Martino, near Monreale, Sicily. 



Differs from the preceding species by its smaller size, less 

 dilated aperture, more elongated form. 



D. HALICIENSIS, Westerlund. 



Shell umbilicated, umbilicus spirally dilated to the aperture, 

 oblong-ovate, diaphanous, greenish hyaline, thinly distantly 



