The animal kingdom, arranged after its organization : forming a natural history of animals, and an introduction to comparative anatomy . sely applied against each other. All these Crustacea are marine. M. Savigny considers them as approaching the Pycno-gonides, and as forming, together with them, the passage between the Crustacea andArachnula. In the first edition of this work, they formed part of the Isopodous order, namely,tlie section Cystibranchise. They may be considered as forming a single genus, for which, on account of its priority, the name of Cyamus (Latr.)—should be retained. Some o
The animal kingdom, arranged after its organization : forming a natural history of animals, and an introduction to comparative anatomy . sely applied against each other. All these Crustacea are marine. M. Savigny considers them as approaching the Pycno-gonides, and as forming, together with them, the passage between the Crustacea andArachnula. In the first edition of this work, they formed part of the Isopodous order, namely,tlie section Cystibranchise. They may be considered as forming a single genus, for which, on account of its priority, the name of Cyamus (Latr.)—should be retained. Some of these (forming a first section named Filiformia, Latr.) have the body long and very slenderor linear, with the segments longitudinal; the legs also long and very slender, and the terminal fila-ment of the antenna; composed of minute joints. They are found amongst plants, creeping along in the same way as the Geometer or Looper-caterpillars, bending themselves often back with great rapidity, and applying their antenna; to variousparts of the l)ody. In swimming they bend the two ends of the body downwards. 430 Vig. 13.—Caprella pliasnia. Leptomera, Latr. {Proto, Leach), has fourteen complete legs (including the pair attached to the head), forminjra regular series. In some of them (as in Gammarus pedatits, Miiller, forming the type of the restricted genuaLeptomera) all the legs (except the two anterior) are furnished with a basal vesicle, whilst in the others (Cancelpedatus, Montague, being the type of Leachs Proto) these appendages exist only at the base of the second andfour following legs. Natipredia, Latr., has ten legs in a continuous series, the second and two following pairs having a vesicularbody at the base. The typical species found on the French coast appears to me to be undescribed. Caprella, Lamarck, have also only ten legs, but the series is interrupted; the second and followingsegments being destitute of legs, but each isfurnished with two
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