ZONITES. 139 



H. PYGM^EA, Bottger. PI. 46, figs. 12-14. 



Much depressed, openty umbilicated, diaphanous, very shining; 

 whorls 3, slowly increasing, distinctly striated at the moderate 



suture. Diam. 1'65 mill. 



Ho,rtkopi, north of Tiflis. 



Is perhaps a young shell, but seems to differ from its associ- 

 ates in its wider umbilicus. 



H. CONTRACTA, Westerluiid. PL 4G, figs. 15, 16. 



Differs from H. crystalline, in having a narrower spire, whorls 

 51-6, very slowly enlarging, the last about equal to the penulti- 

 mate whorl, the shell smaller, aperture and umbilicus narrower. 



Diam. 2'5 mill. 



North Germany, Sweden. 



Perhaps only a local race of H. crystallina. 



H. BOTTERI, Parreyss. PI. 46, figs. 9-11. 



Much depressed, umbilicated, thin, pellucid, vitreous white, 

 very slightly striate ; whorls 5, with deep suture, narrow, aper- 

 ture widely semilunar. Diam. 2'5 mill. 



Greece, Dalmatia, France (Locard). 



Perhaps not distinct from H. contracta. 



H. DUBREUILI, Clessin. PI. 46, figs. 17-19. 



Narrowly perforate, depressed, vitreous, shining, almost 

 smooth ; whorls 5, very slowly enlarging, suture shallow, last 

 whorl but little larger than the penultimate, rounded. 



Switzerland, Southern France, Northern Spain. 



Westerluiid unites this with his H. contracta, from which it 

 only differs by a somewhat wider perforation, and the last whorl 

 being more rounded. Surely the "new school" of conchologists 

 are making hair-splitting distinctions which are in disaccord with 

 the best experience of the variability of specific characters. 



H. ETRUSCA, Paulucci. PI. 46, figs. 20, 21. 



Rather wide!}' umbilicated, vitreous, very shining, with scarcely 

 apparent very minute arcuate growth-lines ; whorls 4-4^, suture 

 impressed and margined, aperture widely lunar. Diam. 2 mill. 



Alluvium of the Arno, Tuscany. 



Perhaps not fully grown ; Westerluiid believes it identical 

 with H Botteri. 



