Note 9 — Class—CRUSTACEA. Sub-Class—CIRRIPEDIA.

Mr. J. D. Dana, who has examined these organs in the larvæ of Lepas, informs me in a letter, that in his opinion they “correspond with the inferior antennæ, the superior being wanting, as in most Daphnidæ.” He continues—“I know of no case in which the inferior are obsolete when the superior are developed; but the reverse is often true.” In position these antennæ certainly correspond to the inferior and central pair of the larva in the first stage, which belong, as it would appear, to the first segment of the body; but judging from the drawing by Burmeister of the larva in the second stage, I am, in some respects, more inclined to consider that they correspond to the larger pair seen within the lateral horns of the carapace in the first stage.