ORCULA. 89 



locality in the Pittental no typical examples, or at most tran- 

 sitions toward such, are to be found, showing this to be a 

 stable local form by the action of local conditions {Wagner). 



Orcula dolium tatrica Wagner. PI, 19, fig. 6. 



This is the smallest form of 0. dolium Drap, yet known to 

 me, showing only 7I/2 whorls, fine growth striae, and in fresh 

 examples a light silky luster. Moreover, the lip-callus is very 

 thin, the lamella on the parietal wall very low, and an upper 

 columellar fold is lacking. Alt. 5, diam. 2 mm. {Wagner, 

 Ann. Zool. Mus. Polonici Hist. Nat. I, 1922, p. 121, pi. 6, 

 f. 40). 



Collected in the Tatra by Slosarski, without nearer local- 

 ization ; from the occurrence of conspicuously small specimens 

 of Pirostoma tumida A. Schm,, P. plicatula Drap. and 

 Clausilia orthostoma Mke. with the same label, a considerable 

 elevation may be presumed. 



Orcula puchsi Zimmermann. PI. 20, figs. 5, 6, 7. 



Shell strikingly slender, gradually tapering from the last 

 whorl to the apex, finely and rather regularly striate, dark 

 corneous-brown to reddish brown, somewhat glossy. Umbili- 

 cus very narrow, almost punctif orm ; neck rounded. The 8I/2 

 to 9I/2 whorls increase slowly and regularly, are relatively 

 strongly convex, and separated by a markedly deep suture, 

 the last whorl forming about one-fifth the length of the shell. 

 Aperture semiovate, rather vertical. Columellar margin 

 deviating little from the longitudinal axis of the shell ; outer 

 margin nearly parallel to it, only a little produced up on the 

 penult whorl. Peristome distinctly expanded, not thickened; 

 whitish; a palatal callus, showing through outside, is always 

 present; its development is irregular, but in the majority of 

 specimens it is well developed though not so strong as in 

 0. spoliata Rossm. ; as in this species, advancing towards the 

 interior and thus narrowing the cavity in a vertical view from 

 below ; there is no fold-like projection inward. The columellar 

 margin is straight and without any indicatio^i of a fold; 

 further inward also it is smooth as seen in a broken shell. 



