The evolution of man : a popular exposition of the principal points of human ontogeny and phylogeny . ?I / X2>. Figs. 258-260.—Lyre-shaped germ-shield of a Chick, in three consecutivestages of development; seen from the dorsal side; enlarged about twentytimes. Fig. 258, with six pairs of primitive vertebras. The brain is a sim-ple bladder (lib). The spinal furrow from x remains wide open ; behind, atz, it is much enlarged, mp, Marrow-plates; sp, side-plates ; y, limit be-tween the pharynx cavity (s7i) and the head-intestine (vd). Fig. 259, withten pairs of primitive vertebrae. The brain has
The evolution of man : a popular exposition of the principal points of human ontogeny and phylogeny . ?I / X2>. Figs. 258-260.—Lyre-shaped germ-shield of a Chick, in three consecutivestages of development; seen from the dorsal side; enlarged about twentytimes. Fig. 258, with six pairs of primitive vertebras. The brain is a sim-ple bladder (lib). The spinal furrow from x remains wide open ; behind, atz, it is much enlarged, mp, Marrow-plates; sp, side-plates ; y, limit be-tween the pharynx cavity (s7i) and the head-intestine (vd). Fig. 259, withten pairs of primitive vertebrae. The brain has separated into threebladders : v, fore-brain ; m, mid-brain ; h, hind-brain; c, heart; dv, yelk-veins. The spinal furrow is still wide open (z). nip, 260, with sixteen pairs of primitive vertebras. The brain has separated PRIMITIVE VERTEBRAE. 289 into five bladders: v, fore-brain; z, twixt-brain; ra, mid-brain; h, hind-brain ; n, after-brain; a, eye-vesicles; g, ear-vesicles; c, heart; dv, yelk-veins ; rap, marrow-plate ; uw, primitive vertebra. developed from an inarticulate worm-form b
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Keywords: ., book, bookcentury1800, bookdecade1870, booksubjectembryologyhuman
