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"Syst. Zool. Stud." SB. Ak. Wien, Abth. 1, xci. 1885, p. 291.

[87]

Zeitschr. wiss. Zool. xiv. 1864, p. 187.

[88]

Viallanes, Ann. Sci. Nat., Series 6, "Zool." xiv. 1882.

[89]

Unfortunately in the Russian language.

[90]

Zool. Jahrb. Abth. Anat. iii. 1888, p. 1.