Charles Doolittle Walcott,
Description of a New Species of Trilobite
(1875)
“ Eyes prominent, subglobose, directed forward and outward from the central eminences of the cheeks; visual surface occupies the outer lateral margins; facial sutures, as far as determined, extend from the posterior third of the lateral margins to the posterior base of the eyes, thence to the top of the eye, curve around the outer margin and then down to the anterior base. Thorax a little longer than the cephalic shield; axial lobe with ten segments, arching forward, narrows very gradually, posteriorly as wide as the lateral lobes ”
