TRUNCATELLINA. 65 



5. 1.6 to 2.2 mm. long, 5y 2 to 6y 2 whorls; Europe, etc. 



T. cylindrica-, no. 4. 

 2x1 mm., 7 whorls ; western Himalayas. 



T. himalayana, no. 9. 



6. Three-toothed, the palatal tooth visible in a direct front 



view 7- 



Palatal tooth further in, not visible in a direct front 

 view 8. 



7. Teeth high, rather large ; length 1.7-2 mm. ; Mediterran- 



ean region, etc T. rivierana, no. 10. 



Teeth small, low ; length 1.65-1.75 mm. ; England. 



T. brittanica, no. 11. 



8. No parietal lamella or tooth ; sharply ribbed ; Triest. 



T. uniarmata, no. 15. 



Parietal minute, pimctiforni, palatal near the suture; 

 Norway T. odontostoma, no. 12. 



Parietal lamella elongate or lamelliform, though some- 

 times low 9. 



9. A massive, rounded crest behind the lip, which is heavily 



white-calloused within ; Sweden to North Germany ; 



Caucasus T. costulata, no. 13. 



Crest wanting or inconspicuous; lip not heavily cal- 

 loused 10. 



10. Surface merely finely striate ; Tyrol, etc 11. 



Surface closely ribbed ; southern France to Caucasus. 



T. claustralis, no. 14. 



11. 2-2.25 mm. long, 6 whorls; Tyrol, etc. T. monodon, no. 15. 



1.5-1.6 mm. long, Qy 2 whorls ; Tyrol. 



T. c. salurnensis, no. 14a. 



(Group of T. cylindrica. Aperture toothless.) 

 4. TRUNCATELLINA CYLINDRICA (Fer.). PI. 8, figs. 1-4, 8. 



The shell is minute, cylindric with obtuse summit, cinna- 

 mon-colored or paler, rather glossy, finely and closely rib- 

 striate except the first whorl. First 2y 2 whorls forming the 

 summit widen rapidly, the following 3 to 4 whorls slowly, 

 forming the cylindric portion; the latter part of the last 

 whorl tapers towards the base. The aperture is shortly ovate, 



