Restoration of <i><a href="https://en.wikipedia.org/wiki/Triarthrus" class="extiw" title="en:Triarthrus">Triarthrus Becki</a></i>, Green, as determined by <a href="https://en.wikipedia.org/wiki/Charles_Emerson_Beecher" class="extiw" title="en:Charles Emerson Beecher">Beecher</a> from specimens obtained from the Utica Slates (<a href="https://en.wikipedia.org/wiki/Ordovician" class="extiw" title="en:Ordovician">Ordovician</a>), 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.<br><small>(After Beecher, from <a href="https://en.wikipedia.org/wiki/Karl_Alfred_von_Zittel" class="extiw" title="en:Karl Alfred von Zittel">Zittel</a>.)</small>
Encyclopædia Britannica, 1911
2012-11-01 21:39:20
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