MADEIRAN SPECIES OP LAURIA. 101 



periphery and above suture; finely, weakly and very lightly 

 striate. 



It lias angular, parietal, columellar and supracolumellar 

 lamella?, as in sphmctostoma, but there is also, in typical 

 arborea, a very small, immersed subcolumellar. Lower- 

 palatal fold flat-topped, a distinct but short upper-palatal 

 between it and the lip tooth. Basal fold well developed. 

 Apex generally more or less worn. 



Length 4.1, diam. 1.7 mm.; 8 whorls. 



Length 4.4, diam. 1.5 mm. ; 7% whorls. 



Length 3.4 mm. 



^Madeira: at higher elevations than sphinctostoma, in 

 woods, in moss and under the loose bark of laurels ; abundant 

 at the Ribeiro Frio, at S. Antonio da Serra, in the Ribeira 

 de Santa Luzia, and indeed throughout the wooded districts 1 

 generally (Wollaston). 



In a series from Santa Cruz (M. Grabham) the shell ia 

 more striate above than in typical arborea, the upper palatal 

 fold is obsolete or very small, and there is no subcolumellar. 

 An immature one of this lot having 6V3 whorls shows 6 evenly 

 spaced radial folds within the base (pi. 11, fig. 14). 



L. sphmctostoma heterodon n. subsp. PI. 11, fig. 7. 



Striate as in sphinctostoma, brownish with an olive-buff 

 band. Supra and infracolumellar lamellae and upper palatal 

 fold are wanting. The angular lamella has no denticle op- 

 posite the lip-tooth. Length 3.5, diam. 1.5 mm. ; 7% whorls. 

 Type 130428 A N S P. 



L. sphinctostoma simulator n. subsp. PI. 12, fig. 11. 



The shell is finely striate on the spire, as in L. s. arborea; 

 dilute chestnut, with the base and a median spiral band on 

 the whorls very pale greenish. Angular, parietal and colu- 

 mellar lamella? smaller than in arborea or sphinctostoma, the 

 parietal not penetrating so deeply; the lower-palatal fold is 

 rather short, moderately high, its summit narrow, rounded 

 (not enlarged or flattened). No basal or upper palatal folds 

 are present; supracolumellar lamella only weakly indicated. 

 Length 3.7, diam. 1.5 mm. ; 7V : ; whorls. Type 5611 A N S P. 



