A Manual of Natural History for the Use of Travellers Being a Description of
A Manual of Natural History for the Use of Travellers Being a Description of
Arthur Adams
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A single eye situated on the middle line at fore and upper part of head ; head indistinct, with no move- able rostrum ; abdomen elongated. III. ORDER KING-CRABS (Xyphosura). Jaws replaced by the basal part of the six pairs of fore-legs, which are furnished at that part with minute teeth ; hind-legs serving for respiration. ] . FAMILY. King - Grabs (Limulidae). Carapace MANUAL OF NATURAL HISTORY. 301 large, rounded, divided into two parts, the anterior large and semilunar, the posterior smaller,... toothed at the sides, and ending in mfr^ *^ a long pointed spine. CIRRHOPODS. The Cirrhopods, generally known under the names of Acorn-shells and Barnacles, are marine articulated animals, forming a class intermediate between the Crustacea and the Mollusca. Their body is more or less jointed, and is placed with the back down- wards, the cirrhated feet being protruded from the aperture of the shell ; the jaws resemble those of Crustaceans, the head is indistinct, and, in the adult, there are no distinct eyes or antennae ; the part cor- responding to the abdomen of Crustaceans is fur- nished with a series of lateral lobes, each bearing two long, curled, many-jointed, ciliated false-feet, which in the living animal are constantly in motion, being al- ternately protruded and withdrawn, causing cur- rents which procure food and subserve respiration.
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