Hollardops mesocristatus with Phacops sp

Hollardops mesocristatus (formerly known as Metacanthina) is a magnificent trilobite from the Middle Devonianat Djebel Issoumour. Hollardops is renowned for its big semi-circular eyes containing multiple schizochroal eye lenses. Phacops are often found in the same deposits as Hollardops, and they too have schizochroal lenses in their eyes..

The Hollardops is 2.77 inches long and 1.66 inches wide. The Phacops (possibly Boeckops )is partially enrolled and is 1.8 inches long (if flattened) and 0.89 inches wide. Trilobites and matrix is 4.33 by 2.45 by 2.11 inches. The schizochroal lenses in both eyes are extremely well-preserved.