The animal kingdom, arranged after its organization : forming a natural history of animals, and an introduction to comparative anatomy . e pair, generally lodged in a cavitybeneath the fore-margin of the carapax, areterminated by two very short [articulated]filaments. The peduncles of the eyes arelarger than in the Macrura. The first pair oflegs is terminated by a claw. The branchiaeare arranged in a single row in the form ofpyramidal plates, composed of a great num-ber of minute leaflets spread one upon theother : the foot-jaws are ordinarily shorterand broader than in the Decapods, the outer
The animal kingdom, arranged after its organization : forming a natural history of animals, and an introduction to comparative anatomy . e pair, generally lodged in a cavitybeneath the fore-margin of the carapax, areterminated by two very short [articulated]filaments. The peduncles of the eyes arelarger than in the Macrura. The first pair oflegs is terminated by a claw. The branchiaeare arranged in a single row in the form ofpyramidal plates, composed of a great num-ber of minute leaflets spread one upon theother : the foot-jaws are ordinarily shorterand broader than in the Decapods, the outer pair forming a kind of family may be regarded as constituting the single genus Cancer,—Comprising the numerous species of crabs [and consisting of a portion only of the Linnaean genusCancer, divisible into seven sections and a great number of minor divisions, regarded by recent authorsas genera]. Of these the majority have the legs attached at the sides of the breast, and always ex-posed. The species thus characteiized constitute the first five sections, Pinnipedes, Arcuata, Quadri-latera, Orbiculata^ aud Fig. 1 (/, outer foot jaw ; tf,/, g-, A, base of the had long perplexed Crustaceologists ; and MLeay, iu order to adopt Ihis quinarian system to these animals, has divided the Decapoda intofive tribes, Tetrrtgonostoina and Trigouostoma (composinfj theBrachyura), and Anomura, Sarobranchia, and Caridea (composingthe Macruura).—//;«sfr. AimiiUts. oj South Afrim, Xo. 3.] * Tlie groups thus indicated are founded upon a general survey ofimportant anatomical characters, and generally correspond with theLinnsean genera, and sometimes also to those of the earlier works ofFabricius. These families are here of greater extent than in myotlier writings ; but if we regard these as primary ordinal divisions,and the groups here called tribes as families, the arrangenaent will befound essectially identical. In the same manner the subgenera hereindicated ought, in
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Keywords: ., bookcentury1800, bookdecade1840, booksubjecta, booksubjectzoology
