"Devil Horned" Cyphaspis Walteri Trilobite Double

Here is nice double specimen of the Devonian trilobite Cyphaspis walteri sometimes referred to as the "Devil Horn" Cyphaspis. Both trilobites are approximately 1.6" long including the spine. All of the spines have been prepared free of the surrounding limestone.

This species was finally formally described in 2014. A link to the paper can be found below.

“Devil horned” Cyphaspis (Trilobita, Otarioninae): examples from the Middle
Devonian of the Ardennes (Belgium), Eifel (Germany) and Ma’der (Morocco)