[1235] Petch 1913.

[1236] Paulson and Thompson 1913.

[1237] Michael 1884.

[1238] Zopf 1907.

[1239] Lesdain 1910.

[1240] Wheldon 1914.

[1241] [See also p. 267.]

[1242] Paulson and Thompson 1913.

[1243] Stone 1896.

[1244] Tutt 1900, p. 107.