Chondroceras wrighti S. Buckman.
Matrix free well preserved complete sphericone Ammonite. Where there is a hole in the outer shell near the termination you can see 4 valves of small Bivalves that have been washed into the body chamber when the empty shell has been lying on the sea bed. Lovely example.
Jurassic, Bajocian, Humphriesianum Zone.
Oborne Wood, Sherborne, Dorset.
Ammonite : 4.2 cm diam.