MADEIKAN SPECIES OP LAURIA. 103 



Paiva renamed this species when under the erroneous im- 

 pression that the name first given was preoccupied. 



35. Laubia laevigata (Lowe). PI. 13, figs. 4. 5. 



The shell is cylindric, slowly tapering above, the summit 

 rounded, obtuse; thin; subtransparent light brownish olive. 

 Surface shining; upper half very finely but sharply striate, 

 the last whorl nearly smooth. Aperture ear-shaped, 4-plicate 

 and with the usual lip tooth. Angular lamella thin, not con- 

 nected with the lip-insertion, penetrating inward nearly to 

 the ventral side. Parietal lamella small and very short, 

 not entering. Columellar lamella small, horizontal, entering 

 to the left side. Lower-palatal fold running to the dorsal 

 side, rising in a. median point. Lip narrowly expanded, 

 slightly reflected, bluntly toothed above. Sinulus rather 

 widely open below. 



Length 4.1, diam. 1.6 mm.; T 1 /^ whorls. 



Length 3.6, diam. 1.55 mm. ; 7y± whorls. 



Madeira : in the southern part, near the head of the Ribeira 

 de Sta. Luzia, under the dead and loosened bark of old 

 laurel trunks (Wollaston). 



Pupa laevigata Lowe, Ann. Mag. N. H. (2), ix, 1852, p. 

 276. — Albers, Malac. Mader. p. 65. — Ppr., Monogr. iii, 544. 



With much the general form of L. sphinctostoma and 

 arborea, this species differs conspicuously by the simpler 

 aperture. There is no callus connecting angular lamella and 

 lip-insertion, and deep within small points arm the free edge 

 of the angular (not always so well developed as in fig. 5 — an 

 obliquely basal view). The parietal lamella is very short, the 

 columellar lamella is low, and no basal fold is present. It is 

 thus very distinct. The striation mentioned in the descrip- 

 tion is sometimes rather weakly developed. 



The immature shell has radial folds in the base arranged 

 as in sphinctostoma, but they are very small and short, three 

 or four being developed in the later stages of youth. No 

 parietal lamella was seen in any of 8 young shells examined, 

 from small to large. 



