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Ch VII

Lubbock, Linn Trans 1860 or 61 p 168. With respect to law that S. S. characters are generally displayed in the very same parts in which species of same genus differ.— He remarks. "The Entomostraca & especially the Cyclopoidea present us remarkable examples of this law. In Pontella, for instance, the sexual characters are afforded mainly by the anterior antennae & fifth pairs of legs. The specific differences also are principally given by these organs; & many of the generic Ø

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characters of the Cyclopoidea are taken from the same source".—

[On some Oceanic Entomostraca collected by Captain Toynbee. Read June 7th, 1860. Transactions of the Linnean Society 23: 173-191.

"Mr. Darwin, in his admirable work 'On the Origin of Species' (p. 156), observes that secondary sexual characters are very variable, that "species of the same group differ from each other more widely in their secondary sexual characters than in other parts of their organization;" and again, "that the secondary sexual differences between the two sexes of the same species are generally displayed in the very same parts of the organization in which the different species of the same genus differ from each other." The Entomostraca, and especially the Cyclopoidea, present remarkable examples of this law. In Pontella, for instance, the sexual characters are afforded mainly by the anterior antennae and the fifth pair of legs. The specific differences also are principally given by these organs; and many of the generic characters in the Cyclopoidea are taken from the same source."]