KOBELT : ON THE LAND SHELLS OF GIBRALTAR. 9 



are slightly arched and increase with regularity, the 

 last one is obtusely angular, shortly bent down in front 

 and flat below. The aperture is oval but slightly 

 angular, crescent-shaped with a simple but distinctly 

 labiated peristome. I have already published the 

 diagnosis of this species in the yearly report of the 

 German Malacozoological Society, ix., p. 70. It is 

 nearest related to the South Spanish derogata, but has 

 the umbilic not expanded towards the aperture. It is 

 only to be found in the higher parts of the rock, clinging 

 to stones, rather isolated, more common on the east 

 side, where it usually crawls about on grasses and 

 Chatncerops. 



16. Helix (Candidula) conspurcata Drap. 



Here and there, not too common. 



17. Helix (Cochlicella) acuta Miiller. 



Only at the lower parts of the rock, in abundance 

 on the rails of the bridge leading to the mainland, and 

 also on windmill flat. 



18. Ferussacia folliculus Gronov. 



A pretty common form in rock crevices. 



19. Stenogyra decollata Linne. 



Not very abundant. 



20. Pupa calpica Westerlund. 



Not rare, but local and difficult to find, its color 

 being so much like that of the rocks. I only gathered 

 it in isolated spots near Rosio Bay. It is however 

 more common on the higher parts of the east side. It 

 is more easily found in those places where the rocks 

 have not long ago been quarried, and are therefore of 

 a lighter color. 



