EIGHTEEN FIGURESThe present paper is one of a series describing the ontogenetic development of the limb muscles of various land vertebrates in a n attempt to place the comparative study of limb musculature on a firmer basis than now exists. The general scope and purposes of the work was discussed in an earlier paper (Rorner, '12, pp. 251-253, etc.) and need not be repeated here.Below is given a description of a series of stages in the differentiation of the muscles and associated structures of the proximal portion of the pectoral limb of Lacerta agilis. As in the work cited, the material used is from the hlinot collection of Harvard University Medical School. A considerable nuniber of embryos was studied in preliminary fashion, and five stages selected for more detailed study. Of these the second, third and fifth were reconstructed by the wax plate method. The major processes of differentiation occur in embryos between approximately 6 mm. and 9 mm. crown-rump length. The muscle terminology employed is essentially that used previously by the writer ('22) for adult lizards.
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