COLUMELLA. 235 



Proc. Zool. Soc. Lond., 1854, p. 207. — Ppeiffer, Mouogr. Hel. 

 Viv., Ill, 1853, p. 532. — Morelet, Hist. Nat. Azores, 1860, p. 

 197, pi. 5, f. 1. — Mousson, Faun. Malae. Canaries, 1872, p. 

 124.— Wollaston, Testacea Atlantica, 1878, pp. 43, 207, 449. 

 — Pupa edentula var., Paiva, Mon. Moll. Mader., 1867, p. 119. 

 —Watson, Journ. de Conchyl., 1876, p. 223. 



This species is readily distinguished from the continental 

 C. edentula by the striate surface as well as by the somewhat 

 different shape, which Lowe, with some exaggeration, termed 

 trochiform. This term is applicable to the young stages, 

 which have a somewhat flattened base and subangular last 

 whorl, but fully mature shells become more rounded. The 

 typical form from Madeira is smaller than edentula. 



Specimens seen from the Canaries (pi. 30, fig. 4, Tenerife) 

 are larger than any of the numerous series from Madeira (figs. 

 2, 3). One from Las Mercedes, Tenerife, measures: length 

 2.25, diam. 1.6 mm., 5% whorls (fig. 4). Those from the 

 Azores (Morelet) do not appear to differ from the Madeirans. 



2. Columella limn^eana (Lowe). PL 30, fig. 1. 



Shell distinctly umbilicate, bulimiform, subpyramidal-ovate 

 or ovate-turrite, rather ventricose, obtusely, closely substriate, 

 thin, fragile, pellucid, pale corneous-yellowish. Five convexly 

 swollen whorls, the last ventricose, produced downward; 

 suture impressed. Aperture oblique, oval, longer than wide, 

 two-fifths to a half of the total length, wholly toothless ; colu- 

 mellar plate expanded and reflected over the umbilicus, sin- 

 uate, a little convex in the middle ; peristome very narrowly 

 expanded, nearly simple, acute, somewhat sinuate above. 

 Length 2.5 to 2.75, diam. 1.5 to 1.75 mm. ; aperture 1 to 1.25 

 mm. long (Lowe). 



Length 2.8, diam. 1.9, aperture 1.2 mm; 5 whorls. 



Madeira : in moss on the trunks of laurels (Lowe) ; S. An- 

 tonio da Serra, Lombarda das Vacas, Ribeiro Frio and Boa 

 Ventura, on trunks of laurels and among fronds of moist 

 ferns, in damp, sylvan districts of an intermediate and lofty 

 elevation (Wollaston). 



Pupa Xvmnceana Lowe, Ann. Mag. N. H., ix, 1852, p. 275; 



