[36] In the Rabbit and probably other Monodelphous Mammalia the segmentation is nearly though not quite regular.

[37] Vide F. M. Balfour, “Comparison of the early stages of development in Vertebrates.” Quart. Jour. of Micr. Science, July, 1875.

[38] Vide Remak, Entwicklung d. Wirbelthiere; and Götte, Entwicklung d. Unke.

[39] Van Beneden, “Développement embryonnaire des Mammifères.” Bull. de l’Acad. Belgique, 1874.

[40] Phil. Trans. 1875.

[41] Fol, Archives de Zoologie Expérimentale, Vol. IV. 1875.

[42] Flemming, “Entwick. der Najaden,” Sitz. d. Akad. Wiss. Wien, Bd. 4, 1875.

[43] Kowalevsky, Mem. Akad. Petersburg, Series VII, 1871.

[44] Archiv. f. mikr. Anat. Vol. XIII. 1877.

[45] Metschnikoff, Zeitschrift f. wiss. Zoologie, 1874.