J 52 Miscellaneous. larvse of no fewer than seventeen have been discovered ; and the food-plants of these belong exclusively to the tvro natural orders Rosacese and Amentiferge, the former nourishing ten species, and the latter fur-nishing food for seven or eight. Of the tvrenty-two species, four are North American, the remainder are European ; and of these, nine (or, again, exactly one half) are known to occur in Britain. Eight of the British species are treated of in the present volume, which thus in-cludes the natural history of nearly the whole of the native forms of the two genera. In his ninth volume Mr. Stainton enters upon the hardest portion of his task, namely the description of the enormous genus Gelechia, the most numerous in species of all the Tineina. The number of British species described by the author in the ' Insecta Britannica ' was no less than ninety-five, and several have since been added to our native list ; the European and exotic species are also very numerous. Under these circumstances, and considering the difficulty attendant on the grouping of such a multitude of nearly related forms, we can hardly wonder that Mr. Stainton has postponed his general consi-derations on Gelechia to his next volume, which, like the one now before us, will contain twenty -four species of the genus. MISCELLANEOUS. O71 the Chevreulius callensis of Lacaze-Duthiers, By Joshua Alder. In the ' Annales des Sciences Naturelles' for November last, M. Lacaze-Duthiers has given an interesting account of an Ascidian of a very peculiar structure, forming, in some respects, a connecting link between the Tunicata and the Lamellibranchiata. This animal the distinguished author conceives to be new and unique, and has therefore constituted for it a new genus under the name of Chev-reulitts. Of the great interest attached to this genus there can be lio doubt ; but M. Lacaze-Duthiers is mistaken in supposing that it is new to science, as it was described upwards of ten years ago (in July 1855), by Professor Stimpson, in the * Proceedings of the Philadelphia Academy of Sciences,' under the name of ^ScAirw^c?/*, and two species characterized, which he had met with in the Chinese seas. A specimen of one of these, /S. papillosus, was kindly sent to me by that eminent naturalist. It bears a great resemblance to the figures given by M. Lacaze-Duthiers, differing principally in the papillose or echinated character of the valvular opening. A species apparently of the same genus was obtained in the Indian Ocean by Dr. Macdonald, who has also characterized it as a new genus, under the name of Peroides. This I only know through a paper of his in the * Trans-actions of the Royal Society of Edinburgh' (vol. xxiii. j). 176), where it is stated to have " two apertures on the same plane, pro-tected by a D-shaped opercular fold of the test common to both." It
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