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"Ventral view of Limulus polyphemus. 1 to 6, The six prosomatic pairs of appendages. abd, the solid opisthosomatic carapace. tels, the post-anal spine (not the telson as the lettering would seem to imply, but only its post-anal portion). operc, the fused first pair of mesosomatic appendages forming the genital operculum." — The Encyclopedia Britannica, 1910

Limulus Polyphemus

"Ventral view of Limulus polyphemus. 1 to 6, The six prosomatic pairs of appendages. abd, the solid…

"Liphistius desultor. Under side of the uplifted genital or first opisthosomatic somite of the female; g, genital aperture; p, pitted plate, probably a gland for the secretion of adhesive material for the eggs; l, the edges of the lamellae of the lung-books of the first pair." — The Encyclopedia Britannica, 1910

Liphistius Desultor

"Liphistius desultor. Under side of the uplifted genital or first opisthosomatic somite of the female;…

"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…