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"Eurypterus Fischeri, Eichwald. Silurian of Rootzikil. Restoration after Schmidt. The dorsal aspect is presented showing the prosomatic shield with paired compound eyes and the prosomatic appendages II. to IV. The small first pair of appendages is concealed from view by the carapace. 1 to 12 are the somites of the opisthosoma; 13, the post-anal spine." — The Encyclopedia Britannica, 1910

Eurypterus Fischeri

"Eurypterus Fischeri, Eichwald. Silurian of Rootzikil. Restoration after Schmidt. The dorsal aspect…

"Galeodes sp., one of the Solifugae. Ventral view with the appendages cut off at the base. I to VI, Prosomatic appendages. s, Prosomatic stigma or aperture of the tracheal system. 1, First opisthosomatic sternite covering the genital aperture g. 2, Second opisthosomatic sternite covering the second pair of tracheal apertures sp1. Sp2, The third pair of tracheal apertures. 10, The tenth opisthosomatic somite. an, The anal aperture." — The Encyclopedia Britannica, 1910

Galeodes

"Galeodes sp., one of the Solifugae. Ventral view with the appendages cut off at the base. I to VI,…

"Galeodes sp., one of the solifugae. Dorsal view. I to VI, Bases of the prosomatic appendages. o, Eyes. a, Lateral region of the cephalic plate to which the first pair of appendages are articulated. b, Cephalic plate with median eye. c, Dorsal element of somites bearing third and fourth pairs of appendages. d, Second plate of the prosoma with fifth pair of appendages. e, Third or hindermost plate of the prosoma beneath which the sixth pair of legs is articulated. 1, 2, 9, 10, First, second, ninth and tenth somites of the opisthosoma. an, Anus." — The Encyclopedia Britannica, 1910

Galeodes

"Galeodes sp., one of the solifugae. Dorsal view. I to VI, Bases of the prosomatic appendages. o, Eyes.…

"Galeodes sp., one of the Solifugae. I to VI, The six prosomatic limbs cut short. o, The eyes. b, c, Demarcated areae of the cephalic or first prosomatic plate corresponding respectively to appendages I, II, III, and to appendage IV. d, Second plate of the prosoma-carrying appendage V. e, Third plate of the prosoma-carrying appendage VI. The prae-genital somite is absent. 1, First somite of the opisthosoma. 2, Second do. S, Prosomatic tracheal aperture between legs IV and V. S' and S'', Opisthosomatic tracheal apertures. 10, Tenth opisthosomatic somite. an, Anus." — The Encyclopedia Britannica, 1910

Galeodes

"Galeodes sp., one of the Solifugae. I to VI, The six prosomatic limbs cut short. o, The eyes. b, c,…

"Garypus litoralis, one of the Pseudoscorpiones. Dorsal view. I to VI, The prosomatic appendages. o, Eyes. Prae-gen, Prae-genital somite. 1, Tergite of the genital or first opisthosomatic somite. 10, Tergite of the tenth somite of the opisthosoma. 11, The evanescent eleventh somite of the opisthosoma. an, Anus." — The Encyclopedia Britannica, 1910

Garypus Litoralis

"Garypus litoralis, one of the Pseudoscorpiones. Dorsal view. I to VI, The prosomatic appendages. o,…

"Garypus litoralis, one of the Pseudoscopions. Lateral view. I to VI, Basal segments of the six prosomatic appendages. o, Eyes. prae-gen, Tergite of the prae-genital somite. I, Genital or first opisthosomatic. 2, 3, 10, The second, third and tenth somites of the opisthosoma. 11, The minute eleventh somite. an, The anus." — The Encyclopedia Britannica, 1910

Garypus Litoralis

"Garypus litoralis, one of the Pseudoscopions. Lateral view. I to VI, Basal segments of the six prosomatic…

"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…

"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, Schiodte, one of the Araneae Mesothelae. Dorsal view. I to VI, the prosomatic appendages; 4, 5, 6, the fourth, fifth and sixth tergites of the opisthosoma. Between the bases of the sixth pair of limbs and behind the prosomatic carapace is seen the tergite of the small prae-genital somite." — The Encyclopedia Britannica, 1910

Liphistius Desultor

"Liphistius desultor, Schiodte, one of the Araneae Mesothelae. Dorsal view. I to VI, the prosomatic…

"Liphistus desultor, Ventral view with the prosomatic appendages cut short expecting the chelicerae (1) whose sharp retroverts are seen. Between the bases of the prosomatic limbs an anterior and a posterior sternal plate (black) are seen. I, The sternum of the first opisthosomatic or genital somite covering the genital aperture and the first pair of lungsacs. In front of it the narrow waist is formed by the soft sternal area of the praegenital somite. 2, the sternite of the second opisthosomatic somite covering the posterior pair of lung-sacs; 3 and 4, the spinning appendages (limbs) of the opisthosoma; a, inner, b, outer ramus of the appendage; II, sternite of the eleventh somite of the opisthosoma: in front of it other rudimentary sternites; an, anus." — The Encyclopedia Britannica, 1910

Liphistius Desultor

"Liphistus desultor, Ventral view with the prosomatic appendages cut short expecting the chelicerae…

"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,…

"Schizomus crassicaudatus, one of the Pedipalpi. Lateral view of a male, II to VI, the prosomatic appendages, the first being concealed; 5, the fifth, and II, the eleventh tergites of the opisthosoma; pa, the conical post-anal lobe." — The Encyclopedia Britannica, 1910

Schizomus

"Schizomus crassicaudatus, one of the Pedipalpi. Lateral view of a male, II to VI, the prosomatic appendages,…

"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…

"Stylocellus sumatranus, one of the Opiliones; after Thorell. Enlarged. A, Dorsal view; I to VI, the six prosomatic appendages. B, Ventral view of the prosoma and of the first somite of the opisthosoma, with the appendages I to VI cut off at the base; a, tracheal stigma; mx, maxillary processes of the coxae of the 3rd pair of appendages; g, genital aperture. C, Ventral surface of the prosoma and opisthosoma; a, tracheal stigma; b, last somite. D, Lateral view of the 1st and 2nd pair of apendages. E, Lateral view of the whole body and two 1st appendages, showing the fusion of the dorsal elements of the prosoma into a single plate, and of those of the opisthosoma into an imperfectly segmented plate continuous with that of the prosoma." — The Encyclopedia Britannica, 1910

Stylocellus Sumatranus

"Stylocellus sumatranus, one of the Opiliones; after Thorell. Enlarged. A, Dorsal view; I to VI, the…

"Thelyphonus sp. Ventral view of the anterior portion of the body to show the three prosomatic sternal plates a, b, c, and the rudimentary sternal element of the praegenital somite; opisth I, first somite o the opisthosoma." — The Encyclopedia Britannica, 1910

Thelyphonus

"Thelyphonus sp. Ventral view of the anterior portion of the body to show the three prosomatic sternal…