The animal kingdom, arranged after its organization : forming a natural history of animals, and an introduction to comparative anatomy . rmed of vesicular, beardedand villose pyramids, arranged, in many, either in two rowsor in separate bundles. The antennae are generally long andexserted ; the ocular peduncles are mostly short. The externalfoot-jaws are generally narrow, long, and palpiform, and donot entirely hide the other [internal] parts of the mouth. The carapax is narrow and more elon-gate than in the Brachyura, and ordinarily terminated in front in a point. MM. Audouin andMilne Edwards
The animal kingdom, arranged after its organization : forming a natural history of animals, and an introduction to comparative anatomy . rmed of vesicular, beardedand villose pyramids, arranged, in many, either in two rowsor in separate bundles. The antennae are generally long andexserted ; the ocular peduncles are mostly short. The externalfoot-jaws are generally narrow, long, and palpiform, and donot entirely hide the other [internal] parts of the mouth. The carapax is narrow and more elon-gate than in the Brachyura, and ordinarily terminated in front in a point. MM. Audouin andMilne Edwards (to whom we must refer for particulars) have noticed that in the lobster {Astacusmarinus, Fab.), in addition to the two large lateral venous canals, there exists a third, lodged in thesternal cavity, in which respect the venous systems of the Macrura and Stomapoda agree. The Ma-crura never [or but in a very few instances] quit the water, and with a very few exceptions they areall marine. Adopting the plan of Delper and Gronovius, the Macrura may be considered as forming but a singlegenus t, Astacus, which may be thus divided :—. Fig. i.—Geliia stellat:: * Tliese appendages are composed of three pieces, namely, a base,(or support to the two others), articulating with the penultimate seg-ment; the terminal segment generally forming with them a fan-likeswimmeret; but in the terminal species the appendages are replacedby filaments. The sub-ahdominal false legs are formed on the samemodel, and vary in number, there being only three or four smallpairs in the Anomala, and wanting in the males {except the antericrpair). In the Hermit Crabs they seem to exist only on one side. But in the subsequent subgenera they are constantly larger, and there arefive pairs, supporting the eggs ntid being useful in swimmirg. In thesection Anomala, the peduncle of the intermediate a tenria is pro-portionably longer, and the two or lour posterior feet smaller, thusapproaching the Brachyura. t The s
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Keywords: ., bookcentury1800, bookdecade1840, booksubjecta, booksubjectzoology
