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Since the publication of "Trilobites of New York" more interesting specimens have been found and prepped. This new topic will complement "Trilobites of New York" by posting trilobites that were not illustrated, new discoveries or specimens of better quality. So as I find these trilobites, I will post them. I'm starting off with a poorly understood trilobite, Ceraurus pleurexanthemus. The problem in understanding this trilobite is that Green's type specimen is buried in shale and what is exposed is not very diagnostic. This has resulted in many different types of Ceraurus being assigned to this species. After the publication of the book I was very fortunate to have the privilege to prepare the holotype and paratype of Ceraurus pleurexanthemus. I'm posting pictures of what they originally looked like and what they look like after preparation. Also posted is a Ceraurus from the Walcott Rust Quarry. Many of these specimens are being commercially collected and made available to collectors and are labeled Ceraurus pleurexanthemus. By comparing the Walcott-Rust Quarry specimen with the holotype, one can see that they are not the same species and the Walcott-Rust Quarry specimens are an undescribed species. Now, anyone that has a Ceraurus in their collection can compare it with the holotype and determine if one has a Ceraurus pleurexanthemus. I have seen Ceraurus from Ontario, Canada that do compare very well with Ceraurus pleurexanthemus. Somebody may have one in their collection. I'm hoping the picture of the prepped holotype and a revision of the Ceraurus will be published this year.