Rev. Biol. Nord France, i. 1889, p. 197.

[423]

SB. Ges. naturf. Berlin, 1893, p. 19.

[424]

System u. Morph. d. Oligochaeten, Prag, 1884.

[425]

See my text-book of Zoogeography (Cambridge, 1895) for fuller treatment.

[426]

Ann. Mag. Nat. Hist. (6) ix. 1892, p. 12.

[427]