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"Section through a portion of the lateral eye of Limulus, showing three ommatidia—A, B and C. hyp, The epidermic cell-layer (so-called hypodermis), the cells of which increase in volume below each lens, l, and become nerve-end cells or retinula-cells, rl; in A, the letters rh point to a rhabdomere secreted by the cell rl; c, the peculiar central spherical cell; n, nerve fibers; mes, mesoblastic skeletal tissue; ch, chitinous cuticle." — The Encyclopedia Britannica, 1910

Limulus

"Section through a portion of the lateral eye of Limulus, showing three ommatidia—A, B and C.…

"Development of notochord : msl, mesoblastic skeletogenous layer ; pdc, paired dorsal cartilage; pvc, paired ventral cartilage; ns, neautral spine; na, neutral arch; tp, transverse process; articular process; c, centrum."—Finley, 1917

Development of the notochord

"Development of notochord : msl, mesoblastic skeletogenous layer ; pdc, paired dorsal cartilage; pvc,…

"Development of the lateral eyes of a scorpion. h, Epidermic cell-layer; mes, mesoblastic connective tissue; n, nerves; II, III, IV, V, depressions of the epidermis in each of which a cuticular lens will be formed." — The Encyclopedia Britannica, 1910

Scorpion Eyes

"Development of the lateral eyes of a scorpion. h, Epidermic cell-layer; mes, mesoblastic connective…