The trilobite camera was made by Nigel Marven to help him try to find and observe a Cameroceras.
In Sea Monsters
101. Dangerous Seas
The next day, Nigel took the trilobite camera to sea and threw it into the water. Soon after, a Megalograptus appeared and tried to feed on the trilobite. Nigel managed to knock it off.
Later, a Cameroceras came to the trilobite cam and ate it.