462 Miscellaneous. systematic zoology, are now those which excite the liveUest interest. Lophogaster tijpicus, a Crustacean discovered by M. Sars on various parts of the Norwegian coast, is one of these forms. Milne-Edwards combined the Eupkausidce and Mysidce with the Squillidce and AmphionidcB to form an order distinct from the Deca-poda, and for which he retains Latreille's name of Stomapoda. This order is characterized by the absence of thoracic branchiae lodged in an internal cavity. Dana has followed the same course, his orders Eubranchia and Anomobranchia being synonymous with Decapoda and Stomapoda. These orders are not, however, so distinct as they seem at first sight. The branchiae of certain Macrourous Decapods (Alpheus, Hippolytes, Stenopus) are only partially covered by the carapace ; and Kroyer has shown that in the genus Sergestes the sides of the carapace are not sufficiently prolonged to cover the branchiae. These exceptions sufficed to show that these two orders of Crustacea form a continuous series ; but, by his description of Lophogaster, M. Sars has made us acquainted with a link which unites them still more intimately. In this Crustacean the thoracic branchiae are ramified like the posterior branchiae of the Euphausidce. The upper part of the rami-fication is covered by the carapace in the manner of the branchiae of the Decapoda, whilst the median and lower branches hang down freely in the water, as in the Euphausidce. Other characters, to which it is unnecessary to advert, render the relationship of Lopho-gaster to both groups still more evident ; and thus it appears that the whole of the Podophthalmous Crustacea form a single natural order. The Stomapoda seem to be only degraded Macrourous Decapods — an opinion which is supported by Professor Dana. The development of Lophogaster is precisely similar to that of Mysis. — Bibl. Univ. Sept. 20, 1864, Bull. Sci. p. 87. On a Peculiarity in the Venation of the Leaves of the Genus Fagus. By Professor A. DeCandolle. In the ordinary condition the lateral veins of a leaf occupy the centre of the lobes, or answer to the extremities of the teeth, when the leaf has lobes or teeth. Of the rare exceptions to this rule M. De Candolle has already indicated three in a note to p. ,558 of vol. ix. of his ' Prodromus,' namely, Coldenia procumbens, Linn,, Cratcegus oxyacantha, Linn., and the Rhinanthi, in all of which the secondary veins correspond with the sinuses, and not with the projections, of the margins of the leaves. In the present paper he describes the occur-rence of the same structure in certain species of Fagus. Of the Beeches of the southern hemisphere, two, namely Fagus Gunnii, Hooker, and F. antarctica, Forst., have the veins constantly and distinctly corresponding with a sinus ; but in some cases the veins even of the same leaf, towards the extremity, run partly to the teeth and partly to the notches. This is the case in Fagus alpina, Popp. & Endl., and even in the common F. sylvatica ; but
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