STAUKODON. 225 



first whorl smooth. The whorls are moderately convex, the 

 last without grooves or crest behind the lip. The aperture 

 is rounded-piriform, containing 5 teeth. The angular lamella 

 is a blunt, callous tubercle close to and in adults connected 

 with the outer termination of the lip. The parietal lamella 

 is long, liigh, and stands remote from the edge of the parietal 

 callus. Columellar lamella short, entering horizontally. 

 There are two rather short but high palatal folds, the lower 

 one longer. No palatal callus. The peristome is slightly ex- 

 panded, thick, of lighter tint than the shell ; outer margin a 

 little straightened in the middle, connected with the columellar 

 margin by a thick, straight, cord-like callus across the parietal 

 wall, bearing the angular lamella. 



Length 1.7 to 1.8, diam. 1 mm.; 4 1 /- r 4i/> whorls. 



Madeira: beneath stones and scoriae in dry, rocky spots of 

 low elevation, in the south of Madeira: Praia. Bay, west of 

 Funchal, under loose pieces of basalt at the top of the cliff 

 at the eastern end (Wollastoii, Leacock) ; Feijaa dos Asnos 

 and Cabo Girao (Baron Paiva). Subfossil in calcareous 

 deposits near Canical (Wollaston). 



Pupa saxicohi LOWE, Ann. Mag. N. H. ix, 1852, p. 278; 

 P. Z. S. 1854, p. 214. PFEIFFER, Monogr. Hel. Viv. iii, 1853, 

 p. 559. KiisTER, Conchyl. Cabinet, Pupa, p. 182, pi. 21, f. 26, 

 27. ALBERS, Malacol. Maderensis p. 62, pi. 16, f. 13, 14. 

 PAIVA, Monogr. Moll. Ins. Mader. 1867, p. 139. WOLLASTON, 

 'IVstacea Atlantica, 1878, p. 237. 



Pupa semmulum LOWE, Ann. Mag. N. H. ix, 1852, p. 278; 

 ^yn. p. 14. PFR., Monogr. iii, 559. 



The cord-like parietal callus and the structure of the angu- 

 lar tubercle are characteristic. 



la. S. suxicola seminulum Lowe (PL 15, fig. 12). Differs 

 from P. saxicola by the smaller, even very minute size, the 

 whorls more swollen, suture deeper, shape more obese, the 

 aperture triplicate, the folds unequal, arranged in a triangle, 

 the ventral largest, the columellar and palatal smaller and 

 subequal; the subangularly somewhat straightened lip bent 

 inward; the upper denticle somewhat distinct inward (Lowe}. 



