102 MADEIRAN SPECIES OF LAURIA. 



This form resembles L. laevigata, but differs by the strong 

 connecting callus between angular lamella and lip-insertion, 

 and the decidedly larger and longer parietal lamella; this 

 however is much shorter than in sphinctostoma, in which the 

 parietal penetrates as deeply as the angular lamella, as seeu 

 in pi. 11, fig. 12. 



34. Lauria wollastoni (Paiva). PI. 13, figs. 1, 2, 3. 



The shell is cylindric, whitish gray with brown bands at 

 suture, periphery and base of last whorl, sharply and very 

 finely striate on the spire, the last whorl smoother. The 

 whorls are moderately convex, the last whorl tapering down- 

 wards, having a spiral impression corresponding to the lower- 

 palatal fold. The folds are visible as white lines externally 

 in well preserved examples. 



Aperture auriform, 9-toothed. Angular lamella large, 

 strongly connected with the lip-insertion ; parietal lamella 

 almost equally large but somewhat immersed. Columellar 

 lamella strong, slanting downward, a small supracolumellar 

 above it. In the outer lip there is a small tubercle close 1 

 to the insertion, an acute, emerging tooth defining the sinulus, 

 a small, short, immersed upper-palatal below it, followed by 

 the rather large but immersed lower-palatal fold. In thel 

 base there is a well developed but immersed fold. The) 

 peristome is reflected, slightly thickened within. 



Length 2.5, diam. 1.2 mm. ; 6i/o whorls. 



Madeira: Pleistocene at Canical. 



Pupa wollsatoni [err. typ. for wollastoni] Paiva, Journ. 

 de Conchyl. 1866, p. 339, pi. 11, f. 2. — Pupa canicalensis 

 Paiva Man. Moll. Mader., 1867, p. 131, pi. 2, f. 8 (new name' 

 for P. wollastoni). — Pupa wollastoni Paiva, Wollaston, 

 Test. Atl. p. 221. 



It resembles L. sphinctostoma arbor ea in the teeth, but the 

 lower-palatal fold is not so flattened. The shell is much 

 smaller and more sharply striate. Though found fossil, it 

 often retains the colored bands. Besides some small dif- 

 ferences in the teeth, it differs from L. sphinctostoma by the 

 small size and finer sculpture. 



