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"View of the ventral surface of the mid-line of the prosomatic region of Limulus polyphemus. The coxae of the five pairs of limbs following the chelicerae were arranged in a series on each side between the mouth, M, and the metasternites, mets. sf, The sub-frontal median sclerite. Ch, the chelicerae. cam, The camerostome or upper lip. M, the mouth. pmst, The promesosternal sclerite or chitinous plate, unpaired. mets, the right and left metasternites (corresponding to the similarly placed pentagonal sternite of Scorpio." — The Encyclopedia Britannica, 1910

Limulus Polyphemus

"View of the ventral surface of the mid-line of the prosomatic region of Limulus polyphemus. The coxae…

"Pierygotus osiliensis, Schmidt. Silurian of Rootzkil. Restoration of the ventral surface, about a third natural size, after Schmidt. a, Camerostome or epistoma. m, Chilarium or metasternite of the prosoma. oc, The compound eyes. 1 to 8, segments of the sixth prosomatic appendage. I' to V', first five opisthosomatic somites. 7', sixth opisthosomatic somite." — The Encyclopedia Britannica, 1910

Pierygotus Osiliensis

"Pierygotus osiliensis, Schmidt. Silurian of Rootzkil. Restoration of the ventral surface, about a third…