[645] F. Bachmann 1913.

[646] Cutting 1909.

[647] Darbishire 1900.

[648] Baur 1904.

[649] [See p. 161.]

[650] Stahl 1877.

[651] Baur 1898.

[652] F. Bachmann 1912 and 1913.

[653] Darbishire 1900.

[654] Fitzpatrick 1918.