You don't. Trilobites are extinct and are only found as fossils.
Trilobite+sand=crab
rock and plankton
trilobite and sand
trilobite and sand
Trilobite + tree
Trilobite + tree
Rock+Plankton
Rock+Plankton
Rock+Plankton
how do you make trilobite on abc 3 alchemy
Shrimp = Trilobite + Water
salamander+sand