Geisonoceras sp. (aff. O. nilssoni sensu A NGELIN, 1880) Volkhovian, P. originalis Zone, erratic boulder E-116, Rozewie, Poland

1. Longitudinal section through adapical part of a phragmocone, ZPAL N!405 ; x 2.

2. Adult specimen, in lateral view (a ) and medial section through a phragrnocone (b); ZPAL NJ395

Geisonoceras sp. from erratic boulder E-116, of Baltic origin from Rozewie, Poland, P. originalis Zone, Volkhovian; reconstruction of the adult body chamber (a); reconstruction of a phragmocone fragment with calcareous deposits (b) and section through the siphuncle of the same specimen (c) from boulder E-116, Rozewie.