15 <! 



70 LAURIA, SUBGENUS LEIOSTYLA. 



( Parietal lamella emerging about as far as the angular; 

 shell ovate-conic, solid, closely rib-striate, with a 

 very small umbilicus; 8 teeth, all emerging to the 

 14 ■{ peristome; length 4 to 4.6 mm. (section Scara- 



bella). L. cassida, no. 25 



Parietal lamella, when present, emerging distinctly less 

 than the angular (15) 



Diam. about % the length ; whorls strongly convex with 

 lamellar ribs ; angular lamella high within, the pari- 

 etal lamella minute or wanting; columellar lamella 

 and lower-palatal fold small ; no other teeth ; length 

 2 to 2.3 mm., 5y 2 whorls (section Mastula). 



L. lamellosa, no. 47 



Not as above; generally relatively longer, or with more 

 whorls (16) 



r Surface ribbed or rib-striate (17) 



| Surface smoothish or finely striate (28) 



Aperture with 4 to 5 teeth ; basal fold wanting or very 



small (18) 

 Aperture with 6 to 8 teeth (20) 



Diam. more than half the length ; a well-developed lip- 

 tooth nearly closing the sinulus; lower-palatal fold 

 long, deeply immersed, its place indicated by a 

 shallow furrow externally; closely costulate; 3.25 to 

 3.6 mm. long; Madeira. L. abbreviata, no. 39 



Diam. less than half the length; lip-tooth nearly obso- 

 lete or wanting, the sinulus open; Porto Santo (19) 



Four well-developed teeth, rarely an additional upper- 

 palatal and basal also; shell cylindric; 3.8 x 1.4 mm. 



L. ferraria, no. 42 

 19 •{ Only the angular well developed; parietal, columellar 

 and lower-palatal present but small, immersed; 

 shell cylindric-tapering, 2 to 3 mm. long. 



L. degenerata, no. 43 



