[367]

Baldwin Spencer, op. cit. pp. 24, 30-31. Not represented in Fig. 191.

[368]

Hochstetter, Morphol. Jahrb. xiii. 1888, p. 153.

[369]

The vertebral vein, which is present only on the right side, may represent the reduced anterior portion of the right posterior cardinal, as Baldwin Spencer (op. cit.) has suggested.

[370]

As an abnormality the adult Frog may retain the embryonic connexion of the right anterior abdominal vein with the heart (Buller, Journ. Anat. and Phys. iii. 1896, p. 211).

[371]

Newton Parker, Trans. Roy. Irish Acad. xxx. 1892, p. 179.