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1. The cells lining the Wolffian ducts are smaller than those lining the enteron.
2. The first indication of the formation of the enteron is seen in the very early embryo shown, from the dorsal aspect, in figure 1.
3. The union of the allantois and the gut accounts for the elongated outline of the enteron in this section.
4. The openings of the Wolffian ducts, wdo, are seen at the lower end of the section of the enteron.
5. This structure as has been noted above, is quite distinct from the other parts of the enteron.