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"Koenenia Mirabilis, Grassi, one of the Palpigradi. A, Ventral view of prosoma and of anterior region of opisthosoma with the appendages cut off near the base; a and b, prosternites; c, mesosternite; and d, metasternite of the prosoma; f, ventral surface of the prae-genital somite; g, sternite of the genital somite (first opisthosomatic somite). B, Dorsal view. I to VI, prosomatic appendages; I, opisth, genital somite (first opisthosomatic somite). C, Lateral view, I to VI, prosomatic appendages; a, b, c, the three tergal plates of the prosoma; prae-gen, the prae-genital somite; 1 to 10, the ten somites of the opisthosoma. D, Chelicera." — The Encyclopedia Britannica, 1910

Koenenia Mirabilis

"Koenenia Mirabilis, Grassi, one of the Palpigradi. A, Ventral view of prosoma and of anterior region…

"Ventral view of a male mygalomorphous spider. I to VI, The six pairs of prosomatic appendages. a, Copulatory apparatus of the second appendage. a, Copulatory apparatus of the second appendage. b, Process of the fifth joint of the third appendage. M, Mouth. pro, Prosternite of the prosoma. mes, Mesosternite of the prosoma: observe the contact of the coxae of the sixth pair of limbs behind it; compare Liphistius where this does not occus. stg, Lung aperture. gn, Genital aperture. a, Anus with a pair of backwardly migrated spinning appendages on each side of it; compare the position of these appendages in Liphistius." — The Encyclopedia Britannica, 1910

Spider

"Ventral view of a male mygalomorphous spider. I to VI, The six pairs of prosomatic appendages. a, Copulatory…