[442]

Holm, Morph. Jahrb. xxix. 1901, p. 365.

[443]

The sacci probably secrete the fluid contents of the ventricles.

[444]

Haller, Morph. Jahrb. xxvi. 1898, p. 345.

[445]

Goronowitsch, Morph. Jahrb. xiii. 1888, p. 427.

[446]

Burckhardt, Das Central-Nervensystem v. Protopterus annectens. Berlin, 1892.