[308] Entwicklungsgeschichte d. Unke.
[309] Lehrbuch d. vergleichenden Embryologie.
[310] Archiv für Micros. Anatomie, Bd. V., and Entwicklungsgeschichte d. Unke.
[311] Quarterly Journal of Microscopic Science, Oct., 1874. [This Edition, No. V.]
[312] “Stammverwandtschaft d. Wirbelthiere u. Wirbellosen” and “Das Urogenitalsystem d. Plagiostomen,” Arb. Zool.-Zoot. Institut. z. Würzburg, Bd. II.
[313] Entwicklungsgeschichte d. Unke, p. 775.
CHAPTER XI.
The Vascular System and Vascular Glands.
The present chapter deals with the early development of the heart, the development of the general circulatory system, especially the venous part of it, and the circulation of the yolk-sack. It also contains an account of two bodies which I shall call the suprarenal and interrenal bodies, which are generally described as vascular glands.