[415] Nienburg 1908.

[416] [See p. 183.]

[417] Wainio 1897.

[418] Baur 1904.

[419] Wolff 1905.

[420] Aigret 1901.

[421] Wainio 1897.

[422] Wainio 1890, p. 67.

[423] Reinke 1895.

[424] Nylander 1858, p. 63.