108 MADEIRAN SPECIES OF LAURIA. 



jects inward; respiratory sinus complete. Length 2-2 1 / 4, 

 diam. 1*4-1% mm.; 6-7 whorls (Lowe). 



Madeira: Pleistocene near Canical, type loc. ; extremely 

 rare living. 



Pupa abbreviata Lowe, Ann. Mag. N. H. ix, 1852, p. 277 ; 

 Proc. Zool. Soc. Lond. 1854, p. 213.— Wollaston, Test. 

 Atl. p. 235. 



This species differs from the ribbed Porto-Santan forms 

 by having the whorls but slightly oblique, the last one quite 

 short, slowly ascending to the aperture, spirally furrowed 

 externally over the lower palatal fold, the base rather 

 pinched. The very high, thin and long angular lamella is 

 united with the lip-insertion by a heavy callus. Parietal 

 lamella rather deep within, long. Columellar lamella hori- 

 zontal. The lower-palatal fold is very strong, long, deeply 

 immersed. There is a small, quite inconspicuous, less im- 

 mersed upper-palatal fold, but so far as can be seen in the 

 aperture, no basal fold. The peristome is expanded, and 

 bears a conspicuous tooth which nearly touches the angular 

 lamella, almost closing the shortly oval sinulus. 



Length 3.6, diam. 1.9 mm. ; 7 whorls. 



Length 3.25, diam. 1.9 mm. ; 7 whorls. 



Said to be not uncommon in the calcareous deposits, but 

 almost unique as a recent shell. It is not closely related to 

 any other species, and just where it belongs in the series is 

 uncertain. 



40. Lauria corneocostata (Woll.). PI. 12, figs. 1 to 5. 



Related to P. relevata, but a little smaller, less lengthened, 

 and a little more remotely ribbed; umbilicus conspicuously 

 wider; whorls generally a little more plainly banded (rarely 

 quite uniform) ; last whorl slightly shorter. Peristome hav- 

 ing a broad corneous reflection, and less continuous, being 

 somewhat interrupted between the columellar and ventral 

 [parietal] lamellae, and conspicuously less raised and stand- 

 ing out. The aperture is more sinuate auriform, (less 

 rounded), and 7-plicate instead of 4, the upper columellar, 

 though minute, is hardly completely obsolete, and the 1st and 



