ABIDA. 279 



According to Caziot, it extends from Bastide-de-Serou 

 (Ariege) to the Atlantic, and is represented in the extreme 

 west (Bayonne) by the form baillensi Dupuy, which reaches 

 Orduna, in the Basque Province of Spain. It does not live on 

 the southern slope of the Pyrenees. 



The figures represent a specimen received from Michaud. 

 The palatal and basal plicae do not penetrate so far as in A. 

 partioU, falling short of the median dorsal line, the minute 

 denticle representing the suprapalatal fold being more lateral 

 than dorsal. The angular lamella is continuous, in a slender 

 cord, with the spiral lamella, which therefore does not exist 

 as a distinct lamella. The inner ends of this and the parietal 

 lamella are together and short of the dorsal line. The typical 

 form of ringens (figs. 12-14) has some small accessory denticles 

 on the parietal wall and peristome, but these are quite incon- 

 stant, and often wanting, as in fig. 15. Westerlund, whose de- 

 scription is given above, mentions two slender parietal lamellae 

 at the left (near the columella), but in several lots seen there 

 is but one ; also in Michaud 's figure. The original description 

 follows. 



Shell cylindric, ventricose, obliquely striate, umbilicate, 

 ashy-corneous; whorls 8 or 9, convex; aperture semilunar, 

 coarctate; peristome reflected, white, triplicate; lip angulate, 

 labium biplicate ; columellar callous, triplicate, the middle fold 

 interior ; all the folds are white ; apex obtuse. Length 3 lines, 

 diam. 1% lines. Bagneres de Bigorre (Hautes-Pyrenees). 

 (Michaud.} 



Var. elongata Moq. Shell longer and less swollen. Bigorre. 



Var. pulchella Moq. Shell smaller and less swollen. Cau- 

 terets; Saint-Sauveur. 



Var. disjuncta Moq. Shell of the same size (5-6 mm. long, 

 2%-3 mm. wide), the peristome not continuous. Cauterets 

 and Saint-Sauveur; 



Var. subringens (Fagot). Narrowly elongate, a little ven- 

 tricose, slowly tapering upward ; 8 to 9 slightly convex whorls, 

 the last compressed laterally. Aperture narrowly oval; 3 

 superior folds, the median much immersed, the last lodged in 

 the columellar angle, sometimes another little rudimentary 



