134 AGARDHIA. 



f Surface finely, closely rib-striate; base umbilieate (5). 

 4 <J Surface smoothish or very slightly striate; nearly im- 

 perforate. A. valsabina, no. 3. 



f Aperture much contracted, the lip-tooth large. 



A. bland, no. 2. 

 | Aperture less contracted, lip-tooth smaller. 



A. ferrari, no. 1. 



Teeth rather small ; parietal callus thin. 



A- biplicata, no. 5. 

 Teeth somewhat larger; parietal callus thick. 



A. bourguignatiana, no. 4. 



M 



Surface distinctly but finely rib-striate. A. bielzi, no. 7. 

 Striation weak, subobsolete. A. excessiva, no. 6. 



' 'Deeply constricted behind the peristome, the constric- 

 tion terminating and strongly deepened below the 

 sinulus. Three strong larnellEe on the parietal wall. 

 Aperture much narrowed, outwardly notched, very 



j oblique, nearly slit-shaped. Rib-striation as in par- 

 reyssii. A. stenostoma, no. 12. 



Not constricted behind the peristome, though often 

 pitted externally at middle of outer lip (9). 



( A distinct tooth within middle of outer lip (10). 

 I A callus in middle of outer lip and extending down- 

 wards, not distinctly tooth-like and often very weak 



L (14). 



f Parietal lamella appearing weakly S-shaped in a basal 

 I view ; a basal fold present ; columellar lamella strong ; 

 10 { aperture narrow. A. lamellata, no. 10. 



I Parietal lamella straight or only slightly arcuate in a 

 ^ basal view; no basal fold (11). 



f Columellar lamella strongly developed; lip-tooth mas- 

 sive; length about 4 mm. (12). 

 Columellar lamella small or wanting; lip-tooth rather 

 small (13). 



9 



11 < 



