This video says about itself:
29 August 2015
Today, at a press conference, there was more clarity.
Mosasaurus hofmanni was the first mosasaur ever discovered amidst much publicity in the eighteenth century, also in Maastricht. The original fossil was stolen from Maastricht by French soldiers, and brought to the Paris museum where it still is.
The newly discovered fossil is 13 meter long, 68 million years old, and is called Carlo, after the ENCI worker who first discovered it.
A twitter message from the museum says that the skull of this mosasaur (the only part of the animal recovered completely so far, though an important part) is about 10% bigger than the Paris specimen’s.
Dutch NOS TV says that probably, after the death of the mosasaur, scavenging sharks dispersed its remains. The search for other parts of the skeleton is still continuing.