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The Microscope (Detroit), 1887-88.

[288]

Zeitschr. wiss. Zool. xlix. 1890, p. 209.

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Ann. Sci. Nat. ser. 3, vol. xv. 1851, p. 158.

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Zeitschr. wiss. Zool. vol. xlv. 1887, pp. 401-467, t. xx-xxii.

[291]

The breadth of the latter is estimated from Reinhard's figure.