Fig. 2From: Ontogeny and morphology of the retrochoanitic septal necks of Agoniatites vanuxemi from the Middle Devonian Cherry Valley Limestone Agoniatites vanuxemi. PRI 68137. Specimen as it occurs in limestone block. Arrow indicates adoral direction. V void space where septa are missing, E early whorls removed for study. Scale bar 1 cmBack to article page