Guide to the Crustacea, Arachnida, Onychophora and Myriopoda exhibited in the Department of Zoology, British Museum (Natural History) .. . rm one of the most important constituents of the plankton,the assemblage of floating organisms in the \vaters of the openocean. Since it is chiefly on this plankton that all the otherinhabitants of the sea ultimately depend for food, it may be saidthat the Copepoda, notwithstanding their small size, play a more 30 Guide to Crustacea. Table-case important part in the economy of nature than any otlier No. 2. Crustacea. Many Copepoda hve as parasites on fishes
Guide to the Crustacea, Arachnida, Onychophora and Myriopoda exhibited in the Department of Zoology, British Museum (Natural History) .. . rm one of the most important constituents of the plankton,the assemblage of floating organisms in the \vaters of the openocean. Since it is chiefly on this plankton that all the otherinhabitants of the sea ultimately depend for food, it may be saidthat the Copepoda, notwithstanding their small size, play a more 30 Guide to Crustacea. Table-case important part in the economy of nature than any otlier No. 2. Crustacea. Many Copepoda hve as parasites on fishes and other aquaticanimals, and as a result of this parasitic life their structurebecomes greatly modified and degenerate. The Order Eucopedoda (Fig. 11) includes the great majorityof the Copepoda, both free-living and parasitic. True paired com-pound eyes are never present, but the median unpaired eye isoften well-developed. Most of the free-swimming species areextremely minute, few^ attaining the size of Eiichacta norvegica, ofwhich specimens are exhibited. Tlie enlarged drawings show thebrilliant colours of some pelagic Calocalanus pavo, one of the free-swimming Copepoda of the (From Lankesters Treatise on Zoology, after Giesbrecht.) The parasitic species are usually much larger than thosewhich live a free life, and a number of species taken from commonfishes are exhibited. Pennclla, wdaich is found on whales andfishes, is the giant of the sub-class, some specimens being evenlarger than that exhibited here. The order Branchiura includes a small number of fish-parasites whose exact relations to the other Copepods are possess a pair of compound eyes, and a piercing stylet, con-nected with a poison-gland, in front of the mouth. ArgvJuafoliaccvs is common on fresh-water fishes in this country. Thelarge Argnlim scutiformis is taken from marine fishes in Japan. Cirripedia. 31 Sub-class CIRRIPEDIA. The members of this group are sedentar
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectcrustacea, bookyear19
