[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.