Archive image from page 164 of The development of the frog's. The development of the frog's egg; an introduction to experimental embryology . developmentoffro00morg Year: 1897 MS B Fig. 44.—Frontal sections through the anterior end of Boml)inator. (After Gotte.) A. Shows three gill-pouches (G), and mesoderm of arches. B. Shows formation of mesodermic somites (MS). PH. Pharynx.

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