The animal kingdom, arranged after its organization : forming a natural history of animals, and an introduction to comparative anatomy . Lepadeaand Baiauoda. 5. PflEcilopoda, including only Xiphosura.*2. Thoracostraca [Podupthalma, Leach], divided into two uuborders, Decapoda and (£dno/,MM«//rta,Leach), Lophyropoda, and Phyllopoda. M. Duverney has, within thelast few months, submitted a Memoir to the Academic des Sciences atParis, proposing a new classification of the Crustacea according to theorgans of respiration, dividing the class into three principal groups,Nudibra
The animal kingdom, arranged after its organization : forming a natural history of animals, and an introduction to comparative anatomy . Lepadeaand Baiauoda. 5. PflEcilopoda, including only Xiphosura.*2. Thoracostraca [Podupthalma, Leach], divided into two uuborders, Decapoda and (£dno/,MM«//rta,Leach), Lophyropoda, and Phyllopoda. M. Duverney has, within thelast few months, submitted a Memoir to the Academic des Sciences atParis, proposing a new classification of the Crustacea according to theorgans of respiration, dividing the class into three principal groups,Nudibranchiae, Cryptobranchiae, and LameUibranchige ; but thcadop-of this, like any other sini;le character, has had the effect of BE IE TILE S ». Li^ndon-rubl!.*-- DECAPODA. 411 The lateral edges of the carapax are bent downwards in order to cover and defend thebranchise, an aperture being left in front of the shell for the passage of the water.* Thebranchiae are situated at the base of the four exterior foot-jaws and of the legs, the fouranterior being smallest. The six foot-jaws are of a diiferent form, applied to the mouth anddivided into two branches, the exterior resembling a small antenna, furnished at the tip witha short multiarticulate piece [and the interior composed of several joints, the two basal beinggreatly dilated in the crabs], the base being also furnished with a long pilose tendinous anterior pair of legs, and sometimes the two or four following, form large claws, thepenultimate joint being dilated, with its lower extremity prolonged into a finger opposed tothe terminal joints or true tragus, which is moveable, and is named the pollex, whilst theother is fixed, and is named the mdex. In Squilla the
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Keywords: ., bookcentury1800, bookdecade1840, booksubjecta, booksubjectzoology
