Guide to the Crustacea, Arachnida, Onychophora and Myriopoda exhibited in the Department of Zoology, British Museum (Natural History) .. . ing the appendages of the trunk, for the mostpart, flattened and leaf-like. It is divided into two Orders, riti/IIopodii and Cladocera. Order 1. -Phyllopoda. The number of somites is large (about 1-i to 40) and the trunk-appendages maybe still more numerous (up to 60), several pairs beingsometimes borne on each somite in the posterior region of the body. The Phyllopoda are specially interesting on account of their 2G Guide to Crustacea. Table-case primitive
Guide to the Crustacea, Arachnida, Onychophora and Myriopoda exhibited in the Department of Zoology, British Museum (Natural History) .. . ing the appendages of the trunk, for the mostpart, flattened and leaf-like. It is divided into two Orders, riti/IIopodii and Cladocera. Order 1. -Phyllopoda. The number of somites is large (about 1-i to 40) and the trunk-appendages maybe still more numerous (up to 60), several pairs beingsometimes borne on each somite in the posterior region of the body. The Phyllopoda are specially interesting on account of their 2G Guide to Crustacea. Table-case primitive characters. In the large number of the somites and theNo. 1. uniformity of the hmbs, as well as in some points of internalstructure (heart, nervous system) they approach more closelythan any other living Crustacea to the hypothetical ancestral typeof the Class. In some respects, however, such as the reduction ofthe mouth-parts, they are considerably specialized. The order includes three Sub-orders (sometimes ranked asOrders) the members of which differ widely in external appear-ance. They are found in fresh water or in brine Ajiua cancriformis, from Kirkcudbrightshire, slightly enlarged.[Table-case No. 1.] In the Sub-order Anostraca there is no carapace and theanimals have a more worm-like appearance than is usual inCrustacea. The eyes are set on movable stalks. The males are dis-tinguished by the remarkable development of the antennae, whichform complicated clasping organs for seizing the females. This is wellshown in the specimen of Streptoccplialus rubricaudatus exhibited. In the Sub-order Notosteaca the carapace forms a broaddorsal shield, resembling, at first sight, that of the ArachnidanKing-crabs. Apiis canerifonnis (Fig. 7) is found in fresh-water Brajic/iiopoda. 27 pools and ditches in many parts of Europe, but it is very uncertain Table-casein its occurrence, and it may suddenly reappear in numbers after ?^*^- ^•an absence of many years. Males are rarely fo
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectcrustacea, bookyear19
