HAAS: ABIDA AND CHONDRINA. 307 



Iu the investigation of these 182 specimens it appears that 

 only 5 tooth-combinations are present, to which is to be added 

 that given for P. kobelti by Westerlund. The combinations 

 follow : 



No. of 

 No. Par. Col. Pal. specimens. Names. 



1. 2 1 3 2 C. k. ordunensis Pils. 



2. 2 1 4 Pupa kobelti West. 



3. 2 2 2 3 



4. 2 2 3 131 



5. 2 2 4 45 



6. 2 2 5 1 



Combination No. 4 (2-2-3) is by far the most frequent, 

 represented by the great majority of specimens received from 

 Hidalgo as Pupa kobelti. Westerlund 's combination, 2-1-4, 

 did not occur in my material. The single occurrence of 2-2-5 

 is noteworthy. 



The dimensions vary between 4 and 8.5 mm. long, 2 and 

 3.5 mm. diameter, with 5% to 8 whorls. 



Common to all specimens examined are the smooth, strong 

 shell, the narrow, basally rounded-triangular aperture, and 

 the presence of a peristome which is reflected on the colu- 

 mellar side only. Internal thickening of the aperture would 

 not be noticed. In the large number of apertural teeth as 

 well as in the general form of the shell, kobelti approaches 

 typical C. avenacea far more than the other Pyrenean and 

 Iberian local races, but the basally triangular aperture is 

 characteristic throughout. This character lends large speci- 

 mens some similarity to C. bigorriensis tenuimarginata, but 

 only superficially, for the absence or only weak development 

 of the spiral lamella indicates their place in the avenacea 

 group. Moreover, these large specimens connect with the 

 smallest ones by a flawless chain of transition forms. An ex- 

 ample of this large form of C. a. kobelti, from Potes, near 

 Santander, is drawn iu pi. 27, fig. 15. 



Pupa kobelti has generally been ascribed to Hidalgo, who 

 sent out many specimens under this name but never published 



