LAURIA, SUBGENUS LEIOSTTLA. 71 



Peristome continuous, the parietal callus raised, oblique ; 

 20 <! 



diam. less than 1,3 the length of over 4 mm. 



L. relevata, no. 41 



Parietal callus adnate (21) 



f Very strongly ribbed; parietal lamella and basal fold 



very small ; diam. more than half the length of 2.7 



21-1 to 3.6 mm. L. calathiscus, no. 45 



I Costulate or rib-striate; parietal lamella well developed 



I (22) 



f Diam. about 1.8 mm.; stout in figure (23) 

 1 Diam. 1 to 1.5 mm.; cylindric (24) 



23 1 



Ovate; subregularly, very finely costulate. 



L. cassidula, no. 30 

 Oblong-cylindric ; irregularly striate. 



L. I. transiens, no. 29a 



9 . f Length less than 2.75 mm. (25) 

 1 Length more than 3 mm. (27) 



Whorls decidedly convex (26) 

 25 -| Whorls only weakly convex; very finely, sharply striate 

 on the spire; 2.5 x 1.2 mm. L. wollastoni, no. 34 



r Lip-tooth denning the sinulus tubercular, well expressed ; 



cyo \ 5 to 5% whorls. L. millegrana, no. 38 



I Upper tooth in the lip thin, entering, not prominent on 



^ the peristome ; 6 whorls. L. monticola, no. 44 



( Lip-tooth defining the sinulus strongly developed; 

 sculpture rather fine. L. sphinctostoma, no. 33 



27 ■{ L. fusca, no. 37 



Lip-tooth weak; sculpture of strong riblets; lip well re- 

 flected. L. corneocostata, no. 40 



,- Angular lamella distinctly connected with the lip-inser- 

 tion (29) 



' Angular lamella not connected with the lip insertion; 

 no supracolumellar lamella; 4 to 6 teeth (32) 



