[31] Keith (1915) 1. 62–68.

[32] Keith (1915) 1. 66.

[33] Keith (1915) 1. 65.

[34] Fleure (1920).

[35] Ripley (1900) 39, 173.

[36] Ripley (1900) 39, 40.

[37] Parkyn (1915); Burkitt (1921) 1. 192–272.

[38] Fleure (1920) 19–21.

[39] Corrêa (1919) 121, 122.

[40] Bourguignat (1868) 43, 48, 49, Pl. vii., viii.