This is a rare specimen of an Trilobite of the species  Albertella helena from the Cambrian of Nevada.
 

This is a Utah trilobite of the species Brachyaspidion microps from the Wheeler Shale Formation.

Here is an inexpensive specimen of a New York trilobite of the species Bumastus ioxus from the classic Rochester Shale.

This is a rare specimen of the trilobite Comptonaspis swallowi from the Carboniferous of Missouri.

Hier ist ein New York Trilobit der Art Dalmanites limulurus aus dem Rochester Shale.
Der Trilobit selber ist etwa 74 mm Lang.

This is a beautiful rolled  trilobite of the species Eldredgeops rana from the Devonian of New York. 

Here is a beautiful and elongated trilobite of the species Eldredgeops rana from the Devonian of New York. 

This Utah trilobite is a detailed specimen of the species Elrathia kingi from the Wheeler Shale.
 

This Utah Trilobite is a large and detailed specimen of the species Elrathia kingi 
The Trilobite itself is about 43 mm long.

Here is a Utah trilobite of the species Elrathia kingi from the Wheeler Shale.

This is a Utah trilobite of the species Elrathia kingi with a length of about 14 mm from the Wheeler Shale.

This is a classic Ohio trilobite of the species Flexicalymene meeki. This specimen is slightly diagenetically compressed on the left side of the body.

Here is a rolled trilobite of the species Flexicalymene meeki from the Ordovician of Ohio. 

This is a beautiful trilobite of the species Triarthrus beckii from the Utica shale of New York.

Here is a inexpensive specimen of the trilobite species Triarthrus beckii from the Ordovician period in the state of New York. Notably or regrettably, the hypostome of this trilobite is visible. It is feature that is otherwise difficult to show.