#Muricid drill hole ( #Oichnus simplex) right between two radials of a #Cardites bicolor

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Here is another instance where the driller tried to avoid drilling over ribs. This saves time(=energy). The ribs and the furrows of these clams
#Cardites tend to widen ventrally. But the drilling snail could not completely avoid the radial ornamentation
#oichnus
#molluscsofsrilanka