J. P. Moore, "The Anatomy of Bdellodrilus," J. Morphol. x. 1895, p. 497.

[433]

Beddard, Trans. Roy. Soc. Edin. xxxv. 1890, p. 629, and xxxvi. 1892, p. 1.

[434]

A. G. Bourne, "On the Naidiform Oligochaeta," Quart. J. Micr. Sci. xxxii. 1891, p. 335.

[435]

F. E. Beddard, Trans. Roy. Soc. Edin. xxxvi. 1892, p. 273.

[436]

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

[437]