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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…

"The right coxal gland of Limulus polyphemus, Latr. a2 to a5, Posterior borders of the chitinous bases of the coxae of the second, third, fourth and fifth prosomatic limbs. b, Longitudinal lobe or stolon of the coxal gland. c, It's four transverse lobes or outgrowths corresponding to the four coxae." — The Encyclopedia Britannica, 1910

Limulus Polyphemus

"The right coxal gland of Limulus polyphemus, Latr. a2 to a5, Posterior borders of the chitinous bases…

"Ventral view of a restoration of Palaeophonus Hunteri, Pocock, the Silurian scorpion from Lesmahagow, Scotland. Restored by R. I. Peacock. The meeting of the coxae of all the prosomatic limbs in front of the pentagonal sternum; the space for a genital operculum; the pair of pectens, and the absence of any evidence of pulmonary stigmata are noticeable in this specimen." — The Encyclopedia Britannica, 1910

Palaeophonus Hunteri

"Ventral view of a restoration of Palaeophonus Hunteri, Pocock, the Silurian scorpion from Lesmahagow,…

"Ventral view of a scorpion. Palamnaeus indus, de Geer, to show the arrangement of the coxae of the limbs, the sternal elements, genital plate and pectens. M, Mouth behind the oval median camerostome. I, The chelicerae. II, The chelae. III to VI, the four pairs of walking legs. VIIgo, The genital somite or first somite of the mesosoma with the genital operculum (a fused pair of limbs). VIIIp, the pectiniferous somite. IXstg to XIstg, the four pulmonary somites. met, the pentagonal metasternite of the prosoma behind all the coxae. x, the sternum of the pectiniferous somite. y, the broad first somite of the metasoma." — The Encyclopedia Britannica, 1910

Scorpion

"Ventral view of a scorpion. Palamnaeus indus, de Geer, to show the arrangement of the coxae of the…