[57]

Vol. II. p. 459.

[58]

Huxley, in 1877 (Man. Anat. Invert. Animals, p. 674), proposed to unite the Enteropneusta with the Tunicata as Pharyngopneusta, in allusion to the gill-slits connected with the pharynx; but the view was first defended in detail by Bateson.

[59]

See, for example, Minot, Amer. Nat. xxxi. 1897, p. 927.

[60]

See MacBride, Quart. J. Micr. Sci. xl. 1898, p. 589; xliii. 1900, p. 351.

[61]

Bury, Quart. J. Micr. Sci. xxix. 1889, p. 409; xxxviii. 1896, p. 125; MacBride, ibid. xxxviii. p. 395; Masterman, Tr. R. Soc. Edinb. xl. Pt. ii. No. 19, 1902, p. 403.