Fig. 1From: The Mayer-Eymar collection of Cenozoic mollusksLeft: Karl Mayer at the age of 33 (from Sacco, 1907); middle: a rare photograph of Mayer in the field (source NMB); right: Karl Mayer-Eymar at the age of around 75 (from Heim & Rollier, 1907)Back to article page