140 ZONITES. 



H. EUSTILBA, Bourg. PL 46, figs. 22, 23. 



Perforate, depressed, spire plano-convex, fragile, pellucid, 

 vitreous, almost smooth ; whorls 5, suture moderately impressed, 

 last whorl a little larger than the penultimate, convexly inflated 

 below, aperture widely semilunar. Diam. 3'5 mill. 



Algiers. 



Distinguished by its inflated last whorl. 



H. JICKELII, Clessin. PI. 46, figs. 24-26. 



Very narrowly perforate, microscopically striate, shining; 

 whorls 6, very narrow, last whorl scarcely wider than the pen- 

 ultimate, aperture very narrow. Diam. 3'2 mill. 



Transylvania. 



Distinguished by its laterally compressed whorls, and very 

 narrow aperture. 



H, LITORALIS, Clessin. PI. 46, figs. 27, '28. 



Very narrowly perforate, depressed, slightly irregularly striu- 

 late, vitreous, shining ; whorls 6, slowly enlarging, very narrow, 

 the last whorl almost double the width of the penultimate, aper- 

 ture narrowly semilunar. Diam. 4 mill. 



Littoral Austria, Croatia. 



Distinguished from H. crystallina by its narrower perforation. 



H. NARBONENSIS, Clessin. PL 46, figs. 29-31. 



Narrowly umbilicated, very finely irregularly striated, shining; 

 whorls 5, the last about double the breadth of the penultimate, 

 mouth rather broadly semilunar. Diam., 3*5 mill. 



Southern France. 



The compressed whorls and narrower umbilicus, and more 

 depresssed form, are said to distinguish it from H. crystallina. 



H. SUBCARINATA, Clessin. PL 46, figs. 32-34. 



Narrowly perforate, glassy, with a polished, finely striated 

 epidermis; whorls 6, flattened above, the last scarcely wider 

 than the penultimate, and obtusely angulatcd superiorly, below 

 which it is convex. Diam., 2*8 mill. 



Transylvania. 

 H. SUBRIMATA, Reinhardt. PL 46, figs. 35-37. 



Very narrowly perforate, thin, pellucid, shining, vitreous, 

 slightly irregularly striate ; whorls 5, narrow, slowly enlarging, 





