MADEIRAN SPECIES OF LAURIA. 109 



3d palatals little distinct but immersed. Length iy 2 to 

 scarcely 2 lines long (Wollaston). 



The shell is hazel, or paler above and below a hazel zone, 

 the apex pale. The upper margin of the peristome is ir- 

 regular, the half between columellar insertion and angular 

 lamella being formed of a heavy adnate callus, reaching as 

 high on the face of the preceding whorl as the upper curve of 

 the outer lip. Only the angular lamella emerges. The 

 supracolumellar is a low, obtuse prominence, deeply placed, 

 in the angle between columella and parietal wall. Lip re- 

 flected with thickened face, pale flesh-colored. There are 

 6 or 7 ribs in 1 mm. on the face of the last whorl. 



Length 3.8, diam. 1.4 mm. ; 7 whorls. 



Length 3.6, diam. 1.35 mm. ; 6% whorls. 



Porto Santo : here and there in fissures of the rocks in the 

 shore zone; especially abundant at Cabeco da Malhada (de 

 Paiva) in the western part of the island, opposite Ilheo de 

 Baixo (Wollaston). 



Pupa corneocostata Wollaston, Testacea Atlantica 1878, 

 p. 227, with var. resticula, p. 228. 



In the still more elongate L. relevata the peristome is built 

 out free of the whorl, hence the teeth are more deeply im- 

 mersed; moreover, its upper margin slopes regularly down- 

 ward, towards the umbilicus, unlike the irregular but roughly 

 level upper margin of the aperture in corneocostata. 



Lauria corneocostata resticula (Woll.). PI. 12, figs. 8, 10. 



Peristome more thickened between columellar insertion and 

 angular lamella, continuous, shell plain dark brown or 

 banded. 



Length 3.85, diam. 1.4 mm. ; 7% whorls. 



Length 3.2, diam. 1.3 mm. ; 6% whorls. 



This form is nearer L. relevata in having the peristome 

 continuous, but it differs by the shape of the superior lip- 

 margin. The smaller figure given is from a Wollaston ex- 

 ample, the larger from one in the Tomlin collection, also from 

 Wollaston. 



