Guide to the Crustacea, Arachnida, Onychophora and Myriopoda exhibited in the Department of Zoology, British Museum (Natural History) .. . nded, laminate, and divided by agroove into an inner and an outer portion ; upon the latter a largecompound eye is present. The somites of the middle portion of the l)ody (thorax or 78 Guide to Trilobita. Table-case mososoma), which vary in numljcr from two to as many as twonty-No. 17. nine, were movahly jointed togcthei- in the hving animal. Eachconsists of a vaulted dorsal area (the tergum), and a Hat mem-l)ranous ventral area (the sternum), and, on each
Guide to the Crustacea, Arachnida, Onychophora and Myriopoda exhibited in the Department of Zoology, British Museum (Natural History) .. . nded, laminate, and divided by agroove into an inner and an outer portion ; upon the latter a largecompound eye is present. The somites of the middle portion of the l)ody (thorax or 78 Guide to Trilobita. Table-case mososoma), which vary in numljcr from two to as many as twonty-No. 17. nine, were movahly jointed togcthei- in the hving animal. Eachconsists of a vaulted dorsal area (the tergum), and a Hat mem-l)ranous ventral area (the sternum), and, on each side, a laminateexpansion overlapping the greater part or the whole of the convexity of the terga and of the upper surface of the laterallaminae gives to the body a three-lobed appearance, from whichthe name Trilobita is derived. The dorsal and lateral plates ofthe somites of the posterior region of the body (pygidium ormetasoma) are immovably united, although generally defined bytransverse grooves. The appendages of the first pair, where known, are each in theform of a single long, branched, antenniform limb. Those of the.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectcrustacea, bookyear19
