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.

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

Here is a Agnostid Trilobite of the species Itagnostus interstrictus from the middle Cambrian of Utah.

This agnostid trilobite belongs to the species Itagnostus interstrictus and comes from Cambrian strata of Utah.
 

This is a detailed Oklahoma trilobite of the species Kainops raymondi. The trilobite presents itself half-rolled on its nice shaped matrix.
 

 Here is a trilobite cluster from the Lower Cambrian of California with the species Olenellus clarki.

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.