MADEIRAN SPECIES OF LAURIA. 93 



Madeira: mainly in the south, in muddy Marchantia- 

 padded deposits of the damp, trickling rocks, in shady ravines 

 of intermediate altitudes, also on the wiry roots of coarse 

 grasses in the constant drip of such places; on perpendicular 

 face of lofty rocks on the eastern side of the Ribeira de Sta. 

 Luzia, about two-thirds of the way up to the waterfall. 

 Also apparently taken by Paiva in northern Madeira 

 (Wollaston) . 



Pupa irrigua Lowe, Ann. Mag. N. H. (2), ix, 1852, p. 276; 

 P. Z. S. 1854. p. 208.— Albers, Malac. Mader. p. 63.— Paiva, 

 Monogr. p. 124. — Pfr., Monogr. iii, 549. — Wollaston, Test. 

 Atl. p. 215. 



A rather large oblong species, resembling L. v. watsoniana 

 in shape ; like that it is often decorticated at the summit. It 

 differs from all forms of vincta by the strong callus connect- 

 ing the angular lamella with the lip-insertion, by the pres- 

 ence of a supra-columellar lamella, and of a small upper- 

 palatal fold. The small basal fold is very deeply immersed. 



The species irrigua, lowcana, transiens, cassidula form a 

 nearly connected series, the successive members discriminated 

 by small differences of sculpture and contour. L. lowcana 

 stands extremely close to the present species, but L. irrigua 

 is a little narrower and decidedly smoother than loweana. 



The radial folds of the young seem to be retained into 

 late youth. A specimen of 6 whorls shows 5, and there were 

 probably more, as the last part of the base is broken away. 



29. Lauria loweana (Wollaston). PI. 10, figs. 13, 14. 



The shell is oblong-ovate, rather densely striatulate, some- 

 what shining, dark umber-brown (generally more or less 

 whitish, decorticated, towards the apex), sometimes obscurely 

 banded, whorls slightly convex, suture impressed. Aperture 

 ear-shaped, ringent, the angles rounded, 5-plicate; there 

 being 2 ventral folds, the outer larger, 2 columellars, the lower 

 larger, 1 palatal ; the outer ventral and lower columellar of 

 about equal size, upper columellar and palatal smaller, in- 

 mersed, somewhat inconspicuous. Outer lip somewhat thick- 

 ened, a little reflected, with an inwardly projecting tooth 



