92 MADEIRAN SPECIES OF LAURIA. 



less striate, usually more olivaceous and frequently more dis- 

 tinctly banded. The shape of the aperture is characteristic, 

 and it has about a whorl less. 



Young shells show 2 to 5 radial folds in the base of the last 

 half whorl (pi. 10, figs. 9, 11). 



27a. L. vincta watsaniana n. subsp. PI. 10, figs. 6. 7. 



Much larger than L. vincta, less conic, the outlines of the 

 spire being more convex ; summit decorticated. Lamella? as in 

 vincta, but there is a larger though still small sub-colum- 

 mellar fold inward from the baso-columellar junction. 



Length 4.4, diam. 2.25 mm. ; 6 whorls. 



Length 4.3, diam. 2.25 mm. 



This form is evidently what Wollaston alludes to as being 

 the largest Madeiran Pupa, with the exception of P. cassida. 

 He notes also that vincta has a larger and a smaller state. 



28. Laueia irrigua (Lowe). PI. 10, figs. 12. 



The shell is minutely perforate, rimate, cylindric-tapering 

 with obtuse, generally worn summit, subtranslucent isabella 

 color, sometimes indistinctly banded; rather glossy, finely 

 striate below the suture, elsewhere smoothish. The whorls 

 are very slightly convex, the last a little swollen behind the 

 outer-basal margin of lip, and slightly concave behind the 

 columellar lip. Aperture is squarish with rounded base, 

 7-plicate. Angular lamella very high, somewhat sinuous, 

 penetrating to the back, joined to the lip-insertion by a! 

 strong callus; often denticulate on the right side within the 

 sinulus. Parietal lamella smaller and shorter. Columellar 

 lamella wide, sloping downward, a smaller, short supra-colu- 

 mellar lamella above it. Lower-palatal fold well developed. 

 A very small upper-palatal is weaMy connected with an in- 

 ward continuation of the tooth on the outer lip bounding the 

 sinulus, the whole parallel to the crest of the angular lamella. 

 A small basal fold stands inward from the baso-columellar 5 

 margin. Peristome brownish, expanded and very little re- 

 flected. 



Length 4.2. diam. 2.1 mm.; 6% whorls. 



