. A manual of zoology. Zoology. 410 ARTHBOPODA. and consists of a medial axis, h, bearing on tlie inside six ' endites,' i, and on the outer side two 'exites,' a tiabellum or epipodite, a, and a gill, A'.. Fio. 411.—Branchiopod appendages. 1 and flfirst and slsth legs oi Branehipuagnitjci (after Gerstacker); ii7, fourth leg of Dap^iiiia . (after Claus). n, flabellum; ft, basis ; i, axon and its endites ; /f, gills. Tliis becomes modified into the sohizopodal form by a loss of the four basal endites (those nearest 6) and the development of the two terminal endites into exopodite and endo
. A manual of zoology. Zoology. 410 ARTHBOPODA. and consists of a medial axis, h, bearing on tlie inside six ' endites,' i, and on the outer side two 'exites,' a tiabellum or epipodite, a, and a gill, A'.. Fio. 411.—Branchiopod appendages. 1 and flfirst and slsth legs oi Branehipuagnitjci (after Gerstacker); ii7, fourth leg of Dap^iiiia . (after Claus). n, flabellum; ft, basis ; i, axon and its endites ; /f, gills. Tliis becomes modified into the sohizopodal form by a loss of the four basal endites (those nearest 6) and the development of the two terminal endites into exopodite and endopodite. Still the schizopodal condition is so nearly universal among Crustacea that it must be accorded great weight in classification. The appendages furnish a further diagnostic character in that two pairs of antenuje are present in the Crustacea (see, however. Trilobitas). Antennas, it will be remembered, are preoral append- ages innervated from the brain. In some cases, as many Ento- mostraca, the second jiair may lose their sensory functions and become mere swimming organs. A carapace, recalling the mantle of the molluscs, is widely dis- tributed in the Crustacea. It arises as a fold from the head, which. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Hertwig, Richard, 1850-1937; Kingsley, J. S. (John Sterling), 1854-1929. New York, H. Holt and Company
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectzoology, bookyear1902
