[97]

Possibly the diverticulum may be wholly derived from the neural tube (see Willey, Quart. J. Micr. Sci. 1893).

[98]

See Lohmann, Schrift. Naturw. Ver. Schlesw.-Holst. xi. 1899, 347.

[99]

Arch. de Biologie, vi. 1887.

[100]

See Journ. of Morphology, xii.-xiv. 1896-1898.

[101]

Bull. Mus. Comp. Zool. xxxv. No. 4, 1899, p. 59.