Acidaspis is an extinct genus of odontopleurid trilobite from the Ordovician to Silurian of North America and Europe. Although small, it had long spines along its body.

Sir Roderick Impey Murchison, 1st Baronet was a Scottish geologist who served as director-general of the British Geological Survey from 1855 until his death in 1871. He is noted for investigating and