Darwin, Vegetable Mould and Earthworms, p. 121.

[428]

"An Attempt to classify Earthworms," Quart. J. Micr. Sci. xxxi. 1890, p. 201.

[429]

Oxford, 1895.

[430]

See especially Vejdovsky, Syst. u. Morph. Olig. Prag, 1884.

[431]

Vejdovsky, Monographie der Enchytraeiden, Prag, 1879. Michaelsen, "Synopsis der Enchytraiden," Abh. Ver. Hamburg, xi. 1889, p. 1.

[432]