Guide to the Crustacea, Arachnida, Onychophora and Myriopoda exhibited in the Department of Zoology, British Museum (Natural History) .. . men of which is mounted above Wall-cases Nos. 5and 6. A specimen of ;i acneus is exhibited which has beenprepared to illustrate the disposition of the branchial passages inCyclometopa, for comparison wath similar preparations of theOxystomata in Table-case No. 18. The third maxilliped has beenremoved on one side to show the quadrilateial shape of themouth-frame (coloured red), characteristic of most arrow indicates the course of
Guide to the Crustacea, Arachnida, Onychophora and Myriopoda exhibited in the Department of Zoology, British Museum (Natural History) .. . men of which is mounted above Wall-cases Nos. 5and 6. A specimen of ;i acneus is exhibited which has beenprepared to illustrate the disposition of the branchial passages inCyclometopa, for comparison wath similar preparations of theOxystomata in Table-case No. 18. The third maxilliped has beenremoved on one side to show the quadrilateial shape of themouth-frame (coloured red), characteristic of most arrow indicates the course of the respiratory current, which,however, may sometimes be temporarily reversed, especially inburrowing species. The tjpical memi)ers of the family Jorltniidac (SwimmingCrabs) may be reeognisetl by the fliittened, paddle-shaped, last Dccapoda —Brachyura. 71 pair of legs. Two British species of the genus Portiinas are Table-caseexliibitecl: the colours of P. depiirator have been carefully copied -^^^ ?^^•from a living individual, and the specimen is mounted on a sampleof the shell-gravel on which it was actually caught. The large. Fig. 47. ?ii(hic(iniiuifi gigas, horn. Tasmania,. The carapace of this specimen is just-ovei- a foot in width. [Above Wall-cases Nos. 5 and G.] Xcpdiiuis [leliKjiciix is the commonest edible Crab in many partsof the East. The Common Shore-Crab, Care inns Duienus, is alsoreferred to tliis family, although the paddle shape of the last legsis not so marked as in the more typical Portunidae. iL Guide to Crustacea. Table-case PodoplitJialuiiis viijil (Fig. 48) is remarkable for the great lengthNo. 15. Qj[ ^YiQ eye-stalks, which is quite unusual among the Cyclometopa,and gives this Crab a curious likeness to the genus Macroph-thahnus among the Ocypodidae {see Table-case No. 16). Tiieresemblance, however, is quite superficial, for in this case it is thefirst of the two segments of the eye-stalk which is elongated, whilein Macrophihahmis it is the second. Th
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectcrustacea, bookyear19
