Text-book of comparative anatomy . exopodite isoften wanting. The distal joint of the protopodite carries a masticatory ridge(lacinia interim), and so does the basal joint of the endopodite (lacinia externa).The remaining one or two joints of the endopodite form the feeler (palp). < LI NT. 1 —OUTER ORGANISATION 313 Ontogeny and comparative anatomy enable us to trace back the anterior maxillreof the Malacostraca to the typical biramose foot. In those Malacostraca which passthrough free Nauplius and Protozocea stages the maxillse are distinctly recognisableas consisting of a protopodite w
Text-book of comparative anatomy . exopodite isoften wanting. The distal joint of the protopodite carries a masticatory ridge(lacinia interim), and so does the basal joint of the endopodite (lacinia externa).The remaining one or two joints of the endopodite form the feeler (palp). < LI NT. 1 —OUTER ORGANISATION 313 Ontogeny and comparative anatomy enable us to trace back the anterior maxillreof the Malacostraca to the typical biramose foot. In those Malacostraca which passthrough free Nauplius and Protozocea stages the maxillse are distinctly recognisableas consisting of a protopodite with a masticatory ridge on the distal joint, an en-dopodite of two or more joints with a masticatory ridge on the basal joint, and anexopodite in the form of a fan-like plate. The exopodite is retained as a vibratilefan-like plate in most Mysidcc (EupJiausia, Thysanopus, Mysis), and in a veryreduced form in many Decapoda. c. The Posterior Maxillae (Fig. 213). The posterior maxillae have the same general typical structure as 3 C. Fio. 213.—Second or posterior maxillae of various Crustaceans. A, Lernaea branchialis, Paranebalia longipes (after G. O. Sars). E, Astacusfluviatilis (after Huxley). F, Cypridina messinensis (after Glaus). G, Cirolana spinipes (aftn-Schioedte). //, Cyclops coronatus ; ;/io«, inner ; m->b, outer maxillipede (endo- and exo-podite of the2d maxilla). /, Limnocythere incisa, anterior limb (after Dahl). K, Lysianassa umbo (after Goes).L, Lysiosquilla maculata (after Brooks). /, Proximal, II, distal joint of the protopodite ; ki,lacinia interna; lr, lacinia externa; a, 6, divisions of the same.; en, endopodite (palp, feeler); ex,exopodite (fan plate). In G: k:, Lacinia interna; k», 13, divided lacinia externa; 7:, masticatoryridge (lacinia). In L :
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectanatomycomparative
