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"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…

"Triarthrus Becki, Green. a, Restored thoracic limbs in transverse section of the animal; b, section across a posterior somite; c, section across one of the sub-terminal somites." — The Encyclopedia Britannica, 1910

Triarthrus

"Triarthrus Becki, Green. a, Restored thoracic limbs in transverse section of the animal; b, section…

"Triarthrus Becki, Green. Dorsal view of second thoracic leg with and without setae. en, Inner ramus; ex, Outer ramus." — The Encyclopedia Britannica, 1910

Triarthrus

"Triarthrus Becki, Green. Dorsal view of second thoracic leg with and without setae. en, Inner ramus;…