X-Ray of Trilobite Fossil

This trilobite is a Calymene sp. found in the Waldron Shale. The fossil was found in Bartholomew County, Indiana USA and dates to the Silurian Period. It was found years ago but it is small thus easy to x-ray. The x-ray did not reveal any thing new except the crack in the matrix that extends through the fossil. So maybe this was a molt. The genus was named by Brongniart in 1822.

If there had been internal remnants of a trilobite it might have looked something like below. It is a drawing done back in 1920 by Dr. Elvira Wood of the Calymene senaria Conrad.