thickly, like a brush, on the anterior cirri. The segments in the shorter ramus of the first cirrus, and in both rami of the second, and often of the third cirrus, are broader than the segments of the posterior cirri; they are, also, especially in the genus Balanus, frequently produced in their upper, ante-lateral corners, into remarkable prolongations (see Pl. 29, fig. 4, of the third cirrus of _Bal. perforatus_), clothed on their inner surfaces, and at their extremities, by numerous bristles. The number of the segments in each cirrus is in some degree variable, and increases with age; this is likewise the case, to a certain extent, with the number of the spines borne on each segment. As compared with ordinary Crustaceans, I presume the two rami answer to the "_tige_" and "_palpe_" of Milne Edwards; and the pedicel (as I have called it) to the two basal segments of the leg.[36] The "_fouet_" or flabellum does not appear to be developed in any Cirripede; for though the filamentary appendages in certain genera of Lepadidæ, might at first be thought to be of this nature, yet their usual position _beneath_ the basal articulation of the first pair of cirri, and the occasional presence of more than one, proves, I think, that such is not the case. [36] According to this author's new nomenclature, the pedicel would consist of the coxopodite and basipodite; the tige would be the ischiopodite and following segments; and the palpe would be the exopodite; the epipodite or flabellum being absent. ('Annales des Sciences Naturelles,' tom. xviii, 1852.)