318 ABIDA. 



folds iii the dorsal position, and again at the inner margin of 

 the peristome. The lower palatal, though deeply excised, is 

 continuous to the margin, and its inner enlargement is visible 

 from in front ; the upper palatal is nearly continuous, but the 

 basal is interrupted, and the inner folds of these two do not 

 show in a face view. Both palatals have more or less developed 

 thread-like continuations inward, visible as light lines outside. 

 The exterior is almost smooth. The figured topotype meas- 

 ures, length 6.7, diam. above aperture 2 mm. ; 9 whorls. 



37. ABIDA STABILEI (Martens). PI. 45, figs. 5, 6, 7. 



Shell obliquely rimate, subcylindric-fusiform, rather smooth, 

 somewhat shining, corneous. Spire gradually tapering, rather 

 acute; whorls 9, scarcely convex, the last slightly narrower, 

 compressed preceding the aperture; suture moderately dis- 

 tinct. Aperture semioval, 7-plicate ; angular lamella moder- 

 ately or very short and thick; median parietal lamella im- 

 mersed, deeply entering; two columellar lamellae approximate, 

 deeply placed, tooth-like; three palatal plicae, of which the 

 upper (towards the suture) is very deeply immersed, very 

 short and callous, often continued inward, very thin and long ; 

 towards the margin of the peristome there is often an incon- 

 spicuous callous which appears to be its forward continuation, 

 but there is always an interruption. The second (or middle) 

 palatal plica is long and strong, and reaches to the peristome ; 

 the third or basal plica, situated at the cervical compression, 

 is very small and rudimentary. Peristome interrupted, mod- 

 erately reflected and expanded, not thick, whitish, with the 

 extremities a little converging. Length 6-7, diam. 2-2y 2 mm. 

 (Stabile). 



Italy, Piedmont : Susa, Valle Dora Riparia at 5-600 meters ; 

 alpine meadows above Crisolo, on Monte-Viso, 1600-1800 

 meters; Valle Stura di Cuneo at Vignolo, 550 meters, and 

 Rocca Sparvera, 560 meters ; Limone ; Valle del Gesso at Ver- 

 nante, at the foot of the Col de Tenda. France: Briangon 

 ( Hautes-Alpes) at over 1300 meters, among limestone rocks 

 on the Mont-Genevre road (Margier). 



Pupa mortttleti STABILE, Mollusques terrestres Vivants du 



