le royaume animal : organisé après son organisation, formant une histoire naturelle des animaux, et une introduction à l'anatomie comparée . rmed des échelles étroitement appliquées l'un contre l'autre. Toutes ces Crustacea sont marines. M. Savigny les considère comme s'approchant des Pyeno-gonides et comme formant, avec eux, le passage entre la Crustacea et Arachnida. Dans la première ctlition de ce travail, ils ont fait partie de l'ordre isopode, à savoir la section Cystibranchia;. Ils peuvent être considérés comme formant un genre unique, pour lequel, en raison de sa priorité, le nom de Cyamus (Latr.)—devrait b

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The animal kingdom : arranged after its organization, forming a natural history of animals, and an introduction to comparative anatomy . rmed of scales closely applied against each other. All these Crustacea are marine. M. Savigny considers them as approaching the Pyeno-gonides, and as forming, together with them, the passage between the Crustacea andArachnida. In the first ctlition of this work, they formed part of the Isopodous order, namely, the section Cystibranchia;. 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 antcnnse composed of minute joints. They are found amongst marine plants, creeping along in the same way as the Geometer or Looper-caterpillars, bending themselves often back mth great rapidity, and applying their antennae to variousparts of the body. In swimming they bend the two ends of the body downwards.. Fis. 13—Caprclla plii 430 CRUSTACEA. Lepfomeia, Latr. (Proto, Leach), has fourteen complete legs (including the pair attached to the head), forminjfa regular series. In some of them (as in Gammarus pedatus, Muller, forming the type of the restricted genusLeptomera) 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. Naupreditt, 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. Caprdla, Lamarck, have also only ten legs, but the series is interrupted; the second and followingsegments being destitute of legs, but each isfurnished wit

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