Contents of volume 83, No. 4 (December 2004)
Rib fracture in Prognathodon saturator (Mosasauridae, Late Cretaceous)
A.S. Schulp, G.H.I.M. Walenkamp, P.A.M. Hofman, B.M. Rothschild & J.W.M. Jagt


A new Ordovician astylospongiid sponge (Porifera) as an erratic from Baltica
F. Rhebergen


A southern North Sea Miocene dinoflagellate cyst zonation
D.K. Munsterman & H. Brinkhuis


A geophysical profile at the foot of the Dutch coastal dunes near the former outlet of the ‘Old Rhine’
A.C. Seijmonsbergen, D.T. Biewinga & A.P. Pruissers