General Zology Practical Systematic And Comparative Being a Revision And Re
General Zology Practical Systematic And Comparative Being a Revision And Re
Orton James
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In lobsters and crabs the mouth is situated underneath the head, and consists of a soft upper lip, then a pair of upper jaws provided with a short feeler, below which is a thin bifid lower lip ; then follow two pairs of membranous under jaws, which are lobed and hairy ; and next, three pairs of foot jaws (Fig. 54). The horseshoe crab has no special jaws, the thighs answering the purpose. The barnacle has a prominent mouth, with three pairs of rudimentary jaws. With few exceptions, the mouths of... insects in the lar- val state are fitted only for biting, the two jaws being horny shears. But in the winged, or perfect, state, insects may be divided into the masticating (as the beetle) and the suctorial (as the butterfly). In the for- mer group, the oral apparatus consists of two pairs of HOW ANIMALS EAT 259 horny jaws (mandibles and inaxillce\ which work hori- zontally between an upper (labrum} and an under (la- bium} lip. The maxillae and under lip carry sensitive jointed feelers (palpi).
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