132 ORCULA. 



Orcula tolminensis a. J. Wagner. (Vol. 27, p. 16). Text- 

 figs. 25, 26. 



Orcula SPOLiATA (Rssm.) (Vol. 27, p. 14). Text-figs. 27, 28, 29. 

 Orcula spoliata austriaca St. Ziin. Text-figs. 30, 31, 32. 



The habitat of this species, of which I have material from 

 more than 60 localities, comprises the eastern part of the 

 northern Dolomites. It differs from 0. spoliata spoliata in 

 dimensions ; it is constantly more slender. The average length 

 lies between 6 and 7 mm., the breadth between 2.6 and 2.8 

 mm.; a further difference is that the whorls are less convex 

 and the suture shallow; only the last whorl is somewhat 

 swollen. Whorls 9-10%. The columellar lamellae are often 

 weaker than in the typical race, the upper always weaker 

 than the lower, and not rarely indicated by only a delicate 

 ridge of the columellar wall. The strongly entering palatal 

 callus is common to both forms, but in austriaca is rather 

 more strongly developed (figs. 30, 32). 



At high elevations it is smaller. On the Goller in lower 

 Austria at an elevation of 1750 meters, as well as on the Rax 

 plateau (Gsollhirn) at height of 1540 meters there is a true 

 high region form, 5.5 x 2.5 mm. The shells are thicker, palatal 

 callus rather stronger; parietal and lower columellar lamellae 

 are weaker, while the upper columellar lamella is not per- 

 ceptible. This is 0. s. austriaca morpha oreina, Text-fig. 33. 



Orcula fuchsi St. Zim. (This vol. p. 89) . Text-figs. 34, 35, 36. 

 Orcula conica (Rssm.) . (Vol. 27, p. 15) . Text-figs. 37, 38, 39. 



The distribution of this species comprises the extreme south- 

 east of the Alps and the contiguous Dinaric mountains, there- 

 fore chiefly the Karawanken Julischen and Steiner Alpen and 

 the elevations southeastward of these mountains including the 

 Kapellen mountains. Nearly all localities are upon Mesozoic 

 limestone. 



The average dimensions are : length 6 to 7 mm., diam. 3 to 

 3.5 mm. Though smaller specimens occur anywhere in its 

 area, they are constant in a few places in the Satnitz 



