Text-book of comparative anatomy . FIG. 277.—Stage G. en, The endodermal cells laden with yolk ; h, rudiment of heart; pr,proctodseum ; ks, germ zone ; A, anus ; m, mesoderm ; ?, upper lip ; st, stomodffium ; ec, m cja T Fio. 278.—Stage H. Lettering the same. In addition : ss, sternal sinus; ga, ganglia of theventral chord ; T, telson ; g, supra-resophageal ganglion.

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Keywords: ., bookcentury1800, bookdecade1890, booksubjectanatomycomparative