[50] Conf. Huxley and Götte.

[51] Cf. Parker (No. [107]).

[52] Annal. de Sciences Nat., 5th Series, Vol. XVII., 1873.

[53] Berlin. Monatsbericht, 1876, p. 703, and Nature, April 5, 1877.

[54] Proceed. of Boston Nat. Hist. Society, Vol. V., 1854.

[55] In confirmation of this view it may be mentioned that in Pipa Americana the tail appears to function as a respiratory organ in the later stages of development (Peters).

[56] The recent observations on this subject are those of Scott and Osborn (No. [114]) on Triton, of Bambeke (No. [95]) on various species of Triton and the Axolotl, and of Clark (No. [98]) on Amblystoma punctatum.

[57] Allen Thomson informs me that the crested Newt, Triton cristatus, is in rare instances viviparous.

[58] Comptes Rendus, 1870, p. 782.

[59] Zeit. f. wiss. Zool., Bd. XXVII. 1876.