MADEIRAN SPECIES OF LAURIA. 107 



lamella is stout, slants downward, and does not emerge to 

 the peristome. A small, less emerging supracolumellar pres- 

 ent. The lower-palatal fold is very stout, its edge broad, 

 but it is rather short ; above it is a strong, short upper-palatal 

 fold, midway between lower-palatal and the lip-tooth. Basal 

 fold stout but short. The peristome is brownish, narrowly 

 •expanded and a little reflected. 



Length 2.3, diam. 1.1 mm. ; 5% whorls. 



Length 2, diam. 1 mm. ; 5 wdtorls. 



Madeira: in the south, also Deserta Grande and the South- 

 ern Deserta (Bugio) ; Pleistocene of Canical and Pta. S. 

 Lo;»renzo. Occurs principally under stones and within the 

 hollows of scoria? of dry and exposed places at a rather low 

 elevation, near the coast (Wollaston). 



Pupa millegrana Lowe, Ann. Mag. (2), ix, 1852, p. 277. — 

 Ppr., Monogr. iii, 558; vi, 333. — Kuester, Conchvl. Cab. p. 

 175, pi. 21, f. 10-12.— Wollaston, Test. Atl. p. 227. 



This is the smallest Madeiran species of the genus; more 

 coarsely sculptured than L. fusca, with a more massive lower- 

 palatal fold. The whorls are strongly convex. 



A young one two-thirds grown has three stout radial folds 

 in the base, at about quarter-whorl intervals. Very young 

 ones of 3-3 1 /-; whorls have one or two (pi. 13, fig. 15). Under 

 the microscope the initial 1% whorls show very delicate light 

 spiral lines in young shells. 



39. Laitria abbreviata (Lowe). PI. 14, figs. 12, 13. 



Shell small, rather solid, compact, short, shortly-oblong, 

 the width two-thirds of the length, very obtuse at both ends; 

 closely costellate-striate, somewhat shining. Whorls 6-7, 

 flattened, closely and equally costellate-striate, the last whorl 

 lightly grooved with a subspiral furrow r , with rather strong 

 oblique, generally sinuous striae, suture distinct. Aperture 

 semioval subtriangular, 4-plicate: two ventral [parietal 

 lamella?] parallel, oblique, and one rather large columellar; 

 one obscure, immersed palatal. Lip rather broadly reflected, 

 above with a bend inward at the distinct tooth, which pro- 



