MA IMURAN SPECIES OF LAURIA. 91 



The spire is more straightly conic than in L. viucta, L. v. 

 watsoniana or L. concinna. The absence of a supracolumellar 

 lamella distinguishes it from L. irrigua, L. loweana ami 

 others. 



In the juvenile stage there are at first 3, later 2 radial basal 

 folds, rather close together. The angular and columella!* 

 lamellre are very large, the parietal very small. 



27. Lauria vtncta (Lowe). PL 10, figs. 8, 9, 10, 11. 



" Differs from cheilogona Lowe by the smaller size, shorter, 

 more obese shape, the apex more obtuse, aperture rounded- 

 oval, not ear-shaped, the shell smoother, more glossy, brighter 

 colored, banded; by the larger ventral [parietal] folds, etc. 

 Near to P. irrigua but surely distinct " (Lowe). 



The angular and parietal lamella? are higher (that is, pro- 

 ject further into the aperture) than in L. cheilogona, but. 

 they are shorter, reaching inward only to a dorsal position, 

 where they diminish rapidly ; the crest of the angular lamella 

 is not serrate. The lower-palatal fold is low, as in L. 

 cheilogona, but it is shorter. The base of the shell is rounded, 

 not pinched laterally, and there is only a very slight spiral 

 groove within the umbilicus. There is no upper-palatal fold, 

 but a minute subcolumellar may generally be seen inward 

 from the baso-columellar junction. The apex is generally 

 decorticated. 



Length 3.5, diain. 2 mm.; 5% whorls. 



Length 3, diam. 1.9 mm.; 5% whorls. 



Madeira : chiefly in the north, on dripping masses of 

 Marchantia polymorphs which pad the rocks at a low eleva- 

 tion, especially at shore level; first waterfall from Sao Vin- 

 cente, along the beach road to Seisal, and Passa d'Areia 

 (Lowe and Wollaston). 



Pupa viucta Lowe, Aim. Mag. N. H. (2), ix, 1852, p. 276. 

 — Albers, Malac. Mader. p. 63. — Pfr., Monogr. iii, 549; iv, 

 675; vi, 321.— Wollaston, Test. Atl. p. 214. 



Besides the differential characters given above, it may be 

 mentioned that this species is more glossy than L. cheilogona, 



