Published online by Cambridge University Press: 06 July 2012
The embryo, as represented by the model, is bent upon itself, at the level of the cranial border of its umbilical orifice—that is, at the caudal end of the pericardial region; and, as a result of the bending, the general outline of the embryo, when viewed from the side, is hook-shaped.
The dorsal and longer limb of the hook is formed by the more caudal portion of the embryo—that is, the part which would lie caudal to the cranial margin of the umbilicus if the embryo were unbent.
page 331 note * Figs. referred to, other than those in Plate XIX, are in the Plates of Professor Cossar Ewart's paper.