The animal kingdom, arranged after its organization : forming a natural history of animals, and an introduction to comparative anatomy . e eminences, having the appearance of eyes, either donot exist, or are not distinctly to be seen, in the genus Para-doxides, Brong. The segments, or at least the majority ofthem, extend laterally beyond the body, and are disengagedat their extremity on the sides. Such are the characters of the five genera established byM. Alex. Brongniart, and which may be arranged into threegroups: 1, the Reniformes (genus .i4^H0*/;M); 2, theContrac-tiles (g. Calymene); 3, t
The animal kingdom, arranged after its organization : forming a natural history of animals, and an introduction to comparative anatomy . e eminences, having the appearance of eyes, either donot exist, or are not distinctly to be seen, in the genus Para-doxides, Brong. The segments, or at least the majority ofthem, extend laterally beyond the body, and are disengagedat their extremity on the sides. Such are the characters of the five genera established byM. Alex. Brongniart, and which may be arranged into threegroups: 1, the Reniformes (genus .i4^H0*/;M); 2, theContrac-tiles (g. Calymene); 3, the Extensi (g. Asaphus, Ogygia, andParadoxides). We refer for a knowledge of the species and? their respective strata, to the work of the above-mentionedcelebrated naturalist, who has associated with him, in respect to the fossil Crustacea, M. Desmarest, so often citedby us in our accounts of fossil and recent Crustacea. Other savans have proposed other genera amongst the Trilo-bites; but being confined to the most general considerations, I can only cite those which appear in the bestwork yet published on these singular Fij;. 2?.—A, Asaphus THE SECOND CLASS OF ARTICULATED ANIMALS FURNISHED WITH ARTICULATED LEGS,— ARACHNIDA,— Is, like the Crustacea, [composed of species] destitute of wings, and which are in amanner not liable to change their form, not undergoing metamorphosis, but simplesheddings of the outer covering of the body. Their sexual organs are placed at adistance from the posterior extremity of the body, being (except in some males) atthe base of the venter. But they differ from these animals as well as from the trueinsects in many respects. As in the latter, the surface of their bodies exhibits orificesor transverse slits, named stigmata (but which it would be better to name Pneumo-stomes,—mouth for the air,—or spiracles, that is, respiratory orifices), serving for theentry of the air, but being few in number, (eight at most, generally only two),
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Keywords: ., bookcentury1800, bookdecade1840, booksubjecta, booksubjectzoology
