Abd, the solid opistho- - - operc somatic carapace.
Opisthosoma without trace of appendages; its posterior somites narrowed to opistho form a movable tail for the support of the post - anal sclerite, which has no poison glands.
Opistho I, First somite of the opisthosoma; opistho 2, second do.; g, genital aperture; 1, edges of the lamellae of the lung-books; m, stigmata of tergo-sternal muscles.
A, Ventral view of prosoma and of anterior region of opistho soma with the appendages cut off near the base; a and b, B, Dorsal view.
The segmentation of the prosoma and the form of the appendages bear a homoplastic similarity to the head, pro-, meso-, and meta-thorax of a Hexapod with mandibles, maxillary palps and three pairs of walking legs; while the opistho io i e d c b o a S' S" 2 I VT V S IV III II I Opisthosoma Prosoma FIG.
I, First somite of the opistho b, c, Demarcated areae of the soma.
Tenth somites of the opistho o, Eyes.