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Figs. 1 — 3. ]\laf<j(irl(a (jrocnlaniHat. 1. Siiifzhergen. 2. (rreeulaiid. Tlic brolicii line inarlvs Ihr limit hetweeii 

 forma ty})ica and var. miiljiiicaiis. 3. Norway and Iceland. — The squares mark specimens, whicli are the 

 true forma typica, the circles (Si)it/bergen) the true var. um])ilicalis. The upjjer zone indicates the diameter, 



tlie lower one the hciglit. 



