. The development of the chick; an introduction to embryology . (/. Fig. 21U. — Diagrams illustrating the development of the hepaticportal circulation. (After Hochstetter.) A. About the fifty-eighth hour. B. Al:)out the sixty-fifth hour; first venous ring formed aroundthe intestine. C. About the seventy-fifth hour; the left limb of the first ve-nous ring has disappeared. D. About the eightieth hour; the second venous ring is estab-lished. E. Aliout the one hundredth hour; the right liml) of the secondvenous ring has disa]ii)eared. F. Hepatic circulation about the one hundred and thirtiethho

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. The development of the chick; an introduction to embryology . (/. Fig. 21U. — Diagrams illustrating the development of the hepaticportal circulation. (After Hochstetter.) A. About the fifty-eighth hour. B. Al:)out the sixty-fifth hour; first venous ring formed aroundthe intestine. C. About the seventy-fifth hour; the left limb of the first ve-nous ring has disappeared. D. About the eightieth hour; the second venous ring is estab-lished. E. Aliout the one hundredth hour; the right liml) of the secondvenous ring has disa]ii)eared. F. Hepatic circulation about the one hundred and thirtiethhour, immediately before the disappearance of the intermediateportion of the meatus venosus. a. i. p., Anterior intestinal {)ortal. D. C, Duct of Cuvier. int.,Intestine. M. V., Meatus venosus. (Es., Pc, Pan-creas. St., Stomach. S. v., Sinus venosus. V. c. Vena cavainferior. V. Hepatic veins. V. o. m., Omphalomesenteric vein,v. r. 1, First venous ring. v. r. 2, Second venous ring. V. u. d.,Right umbilical vein. V. n. s., Left umbilical vein. 366

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