MAUEIRAN SPECIES OF LAUEIA. Ill 



Length 3.8, diam. 1.4 mm. 9-10 riblets in the space of 1 

 mm. on face of last whorl ; closer on preceding whorls. 



Madeira group: Porto Santo, in mountains of the western 

 part; Pico d'Anna Perreira in crevices of the exposed, 

 weather-beaten rocks; also Pico d'Espigao (Wollaston). 



Pupa ferraria Lowe, Ann. Mag. N. H. (2) ix, 1852, p. 277 ; 

 P. Z. S. 1854, p. 211.— Wollaston, Test. Atl. p. 230. 



Wollaston has discriminated L. ferraria and L. corneo- 

 costata, very clearly. The former, somewhat thinner, has 

 more numerous riblets, a narrower, more rounded-out outer 

 lip; the columellar insertion and angular lamella less con- 

 nected, the callus there being thin and longer in ferraria; 

 there is no tubercle in the supracolumellar region and the 

 upper-palatal and basal folds are wanting or reduced to very 

 indistinct vestiges. The parietal lamella is smaller and the 

 angular thinner in ferraria. 



This species is not so common in collections I have seen as; 

 L. corneocostata. The latter is often foimd under the name 

 ferraria. 



The upper-palatal and basal folds are sometimes present 

 though small. 



43. Lauria degenerata (Woll.). 



Shell subconic-cylindric, being slightly tapering towards 

 the apex, opaque, pale brown, remotely but sharply and 

 obliquely ribbed. Whorls convex, strongly swollen, some- 

 times obsoletely subfasciate. Aperture small, rounded, dis- 

 tinctly 1-plicate, but showing 4 indistinctly, as follows: two 

 on the ventral [parietal] wall, the outer [angular lamella] 

 being small, short, the inner [parietal] minute, deeply im- 

 mersed and inconspicuous; one small, deeply immersed colu- 

 mellar (no upper columellar) ; and one immersed, subobsolete 

 palatal fold. Peristome incomplete, being continued only 

 as a thin callus between columellar and angular lamella. 

 Outer lip rounded outwardly, the denticle obsolete: sinulus 

 open, indistinctly defined. Length l-l 1 /-* lines {Wollaston). 



Madeira group: Porto Santo; four examples found among 



