. Science of the sea. An elementary handbook of practical oceanography for travellers, sailors, and yachtsmen. uently taken. Several have special luminous organs,provided with lens and reflector, in different parts oftheir bodies (Fig. 118). The subdivision, which includesthe lobster and shrimp, is termed Macrura—the long-tails ; few of these are planktonic when adult,but some prawn-like forms are widely found. Mentionmust be made, however, of the curious little Sergestids(Fig. 130), not only because they are often captured,but also because of their curious larvae (Fig. 129). Lessadapted to a
. Science of the sea. An elementary handbook of practical oceanography for travellers, sailors, and yachtsmen. uently taken. Several have special luminous organs,provided with lens and reflector, in different parts oftheir bodies (Fig. 118). The subdivision, which includesthe lobster and shrimp, is termed Macrura—the long-tails ; few of these are planktonic when adult,but some prawn-like forms are widely found. Mentionmust be made, however, of the curious little Sergestids(Fig. 130), not only because they are often captured,but also because of their curious larvae (Fig. 129). Lessadapted to a swimming life are the Brachyura, or short-tails, of which the common crab is a member ;some can swim a little, and one at least has been foundin quantity about 200 miles from shore over very deepwater. Crabs are also found attached to gulf-weedand other floating objects. The larvae of Crustacea are often even more numerousthan the adults. Most marine Crustacea hatch out of theegg in the form called a Nauplius, which may be knownby a shield-shaped body, a single eye, and three pairs CRUSTACEAN LARVAE 181. Fig. i20. — NaupliusLarva of a Barn-acle. (AfterClaus.) Fig. 121.—Nauplius Fig. 122. — ZoeaLarva of Pe nm u s . Larva of Pen^eu s .(After Claus.) (After Claus.)
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectocean, bookyear1912
