Here is a example of a Ctenocephalus coronatus with positive and negative side.

Here is a inexpensive  example of a Ormathops atavus from Rokycany. On a typical Rokycany nodule.

This trilobite is a Scabriscutellum from Morocco with a interesting pathology on the pygidium.

Here is a trilobites plate with a Lloydolithus lloydi toether with some negatives.

Here is a nice and detailed preserved Barrandia homfrayi  from Minsterly .

This is a trilobite head of the species Dalmanitina socialis from the Ded Hill site.

Here is a "Morocco Trilobite" of the species  Gerastos tuberculatus  from the Jbel Oufaten.

 This trilobite is a unusual Harpes from the Devonian of Morocco.

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

Here is a nice plate with three trilobites of the species Cedaria minor from the Weeks Formation.

Here is a Modocia weeksensis from the upper Cambrian Weeks formation of Utah

Here is a nice Modocia typicalis from the Marjum - Formation of Utah.

This is a inexpensive trilobite of the species Eldredgeia venustus from the Devonian of Bolivia.
The trilobite-concretion comes with positice and negative side.

Here is a trilobite of the species Ogyginus corndensis from Wales.

Here is a nice  trilobite of the species Ogyginus corndensis with both cheeks.

Here is a inexpensive Paralejurus rehammanus  with a goood and detailed prevervation.

This is a trilobite rarity from the Ordovician of Portugal. This trilobite belongs to the rare species  Eoharpes macaoensis. This Eoharpes macaoensis comes with positive and negative side.

This is a inexpensive Lonchodomas drummuckensis from the upper Ordovician of Scotland.

This is a good example of a relative rare Seleneceme acuticaudata from the Hope Shales of Minsterly.

Here is a rare soft body arthropod of the genus Emeraldella from the Weeks - Formation of Utah.
Emeraldella is one of the fossils of the conservat- resting-placeagerstätte of the Weeks - Formation.

 This is a trilobite of the species Cedaria minor from the Weeks Formation of Utah.

Here is a exampple of the rare "Weeks Trilobite" species Menomonia sahratiani
The specuies Menomonia sahratiani  was just recently (officially) rediscriped by Robison & Babcock in 2011. This trilobite was also disciped in the unpublished "Shanan Peters Dissertation", 2003 as Nephalicephalus beebe. Infomations of the status of the "Shanan Peters Dissertation" are sparsely.

This "Valongo Trilobite" of the species Placoparia tournemini comes with the positive and negative side as well.

Here is a nice "Utah Trilobite" of the species Asaphiscus wheeleri on a nice Matrix.