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3A. above, on the dorsal side, the episomites, the double row of primitive or muscular segments; and 3B. below, on each side of the gut, the hyposomites, the two lateral plates that give rise to the sex-glands, and the cavities of which partly unite to form the body-cavity.
The double cervical cavity of the Amniotes is very interesting, both from the anatomical and the evolutionary point of view; it corresponds to a part of the hyposomites of the head of the lower Vertebrates that part of the ventral coelom-pouches which comes next to Van Wijhe's "visceral cavities" below.
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