160 EUROPEAN SPECIES OF VERTIGO. 



V. genesii, 78; dic<za, 63; celata, 64; inermis, 62; eggeri, 



66 ; regularis, 65. 



Aperture toothed. 3. 



3. No crest behind the peristome. 4. 

 Having a crest. 6. 



4. No palatal callus, the palatal folds standing free. 5. 

 Palatal folds united in front by a palatal callus. 



V. eremia, 61. 



5. One parietal lamella or none: V. daliaca, 69; pineticola, 

 70 ; krauseana, 26 ; hebraica ; gemma, 71 ; ovoidea, 72 ; 

 arctica, 67; tatrica, 67&; alpestris, 74; achetta, 76; Tiek^, 

 74a ; haeusleri, 52a ; schultzii, 75 ; helvetica, 74d ; leontina, 

 74b ; buttneri, 77. 



Having two lamellae on the parietal wall: thibetica, 

 vol. xxiv, p. 138. 



6. No palatal callus between the palatal folds. 7. 

 Palatal folds united by a palatal callus. 8. 



7. No impression behind the outer lip, crest weak : V. decora, 

 25 ; rwmebynesis, 68 ; graellsiaiia,, 56. 



An impression between the strong crest and the edge of 

 outer lip: V. antivertigo, 45; lilljeborgi, 46; kusteriana, 

 536 ; latasteana, 45. 



8. One parietal lamella : V. moulinsiana, 53 ; pachygaster, 

 54; pygmcea, 52; loroisiana, 55; aprica, 57; codia, 58; 

 briobia, 59 ; microlena, 60. 



Two lamellae on parietal wall : F. sieversi, 73 ; substriata, 

 51 ; reneana, 45c ; bcmdoni, 47 ; discheilia, 49 ; maresi, 50. 



9. Upper palatal fold not longer than the lower when 

 present. 10. 

 Upper palatal fold very long, entering to the dorsal side ; 

 columellar lamella spirally ascending, blunt : V. angustior, 

 81 ; callista, 82. 



10. 5 to 10 teeth: V. pusilla, 42; erlandi, 44; collina, 43. 

 2 or 3 teeth : T. otostoma, 79 ; clevei, 80. 



Group of V. pusilla. 



These are merely sinistral species, otherwise like the 

 vertigo group. 



