[1] Beddoe (1885) 29; Holmes (1907) 434, 437, 440; Macalister (1921) 2. 41–49.
[2] Moir (1921) 390–411; Burkitt (1921) 2. 456, 7; Man xxii. 33.
[3] Macalister (1921) 1. 148–177.
[4] Keith (1915) 1. 228–244; Schötensack (1908).
[5] Keith (1915) 1. 293–452; Dawson, etc. (1913); Boule (1915).
[6] Keith (1915) 1. 178–193; Duckworth (1913); Macalister (1921) 1. 222, where other authorities are cited.
[7] Nature, 12th October, 1916.
[8] The question is well discussed by Macalister (1921) 1. 196–204, who gives numerous references.
[9] Osborn (1921) 585, 6.
[10] Obermaier (1906–7).