122 LAUKIA, AZORES ISLANDS. 



The Azores Pupillidae are chiefly known by A. Morelet 's 

 account in Notice sur l'Histoire Naturelle ties Acores, 1860. 

 Some notes were given by H. Drouet in Elements de la Faune 

 Acoreenne, 1861. Wollaston has critically reviewed them in 

 Testacea Atlantica, 1878. 



One of the species, L. rugulosa, described from a single 

 shell. I have not seen. 



Section Petrarca Pils. 

 Petrarca Pilsbry, this volume p. 45. 



Like Lauria proper ; angular and columella!* lamellae are 

 present, but no folds in the outer and basal margins. The 

 surface is finely striate ; banded with brown or bicolored. 

 Type L. fasciolata. 



The sculpture and color of L. fasciolata give reason for be- 

 lieving it derived from Leiostyla, degenerate in apertural 

 teeth. Otherwise its structure is exactly that of Lauria 

 proper, and especially of L. fanalensis; a resemblance here 

 interpreted as an instance of convergent evolution. 



51. Lauria fasciolata (Morel.) PI. 7, figs. 16-19. 



The shell is deeply rimate, oblong ovate, thin, veiy minutely 

 striate under a lens ; pellucid ; corneous, buff or tawny, 

 broadly banded with chestnut. Spire obtuse, the summit 

 slightly tapering; 5 slightly convex w r horls. Aperture oval, 

 obtusely angular at the base, biplicate : one entering parietal 

 fold, emerging in an acute triangular lamella, and one slightly 

 emerging columellar fold. Peristome is a little expanded, 

 somewhat lipped, the right margin arcuate, thickened above 

 the middle, the columellar a little dilated and nearly straight. 

 Length scarcely 3, diam. scarcely 2 mm. (Morel.). 



Azores: " all the islands, under stones '" (Morelet and 

 Drouet). Horta, Fayal (Dr. W. H. Rush, 1890) ; S. Miguel 

 (from 0. Boettger coll.). 



Pupa fasciolata Morelet, Hist. Nat. des Acores, 1860, p. 

 198. — Ppeipfer, Monogr. viii, p. 872. — Wollaston, Testae. 

 Atlant. p. 45. 



