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"Megalaspid extenuatus. One of the Asaphidae allied to Illaenus, from the Ordovician of East Gothland, Swedan." — The Encyclopedia Britannica, 1910

Megalaspis

"Megalaspid extenuatus. One of the Asaphidae allied to Illaenus, from the Ordovician of East Gothland,…

"Restoration of Triarthrus Becki, Green, as determined by Beecher from specimens obtained from the Utica Slates (Ordovician), New York. A, dorsal; B, ventral surface. In the latter the single pair of antennae springing up from each side of the camerostome or hypostome or upper lip-lobe are seen. Four pairs of appendages besides these are seen to belong to the cephalic tergum. All the appendages are pediform and bi-ramose; all have a prominent gnathobase, and in all the exopodite carries a comb-like series of secondary processes." — The Encyclopedia Britannica, 1910

Triarthrus

"Restoration of Triarthrus Becki, Green, as determined by Beecher from specimens obtained from the Utica…

Asaphus is a genus containing at least 35 species of Ordovician trilobites found primarily in Europe. All were benthic predators or detritivores. The typical individual was about 2–7.5 cm in length. The cephalon was smooth, and the glabellum tends not to be distinct from the cephalon. The segments of the pygidium are fused together, though some hint of segmentation may be apparent.

Asaphus Gigas a Trilobite

Asaphus is a genus containing at least 35 species of Ordovician trilobites found primarily in Europe.…