Centroceras tetragonum (d'Archiac & Verneuil, 1842) from the Late Givetian Świętornarz beds, Śniadka by Bodzentyn, Holy Cross Mts., Poland. 1. Protoconch and the first whorl in lateral (a) and ventral (b) views, alsoenlarged (c). 2. Fragment of a subadult phragmocone in lateral (a) and umbilical (b) views,

Centroceras tetragonum (d'Archiac & Verneuil, 1842) from the Late Givetian Świętornarz beds, Śniadka by Bodzentyn, Holy Cross Mts., Poland; reconstruction of a subadult shell (a); section through ventral part of the septum and througha siphuncle fragment (b).