Fig. 3 in The cephalopods of the Boda Limestone, Late Ordovician, of Dalarna, Sweden

Fig. 3. Variation in relative siphuncle size, position and angle of expansion in Cameroceras hasta (Eichwald, 1860) (grey points) and Cameroceras turrisoides sp. nov. SPR = the minimum distance of the connecting ring from the conch margin, divided by the corresponding conch height.