. Anatomischer Anzeiger. Anatomy, Comparative. 633 The papilla lagenae lies anteriorly to the ridge, and posterior to this is the papilla basilaris lying on the basilar membrane. Even the duct connecting sacculus and cochlea shows indications of a double origin. A comparison of series of horizontal sections through the pars inferior of Rana fusca and Lacerta agilis respectively, first convinced me of the homology of the parts of the cochlea in the two groups, as far as the results of my own observations were concerned. The chief differences are due to the fusion of the lagena and pars basilari
. Anatomischer Anzeiger. Anatomy, Comparative. 633 The papilla lagenae lies anteriorly to the ridge, and posterior to this is the papilla basilaris lying on the basilar membrane. Even the duct connecting sacculus and cochlea shows indications of a double origin. A comparison of series of horizontal sections through the pars inferior of Rana fusca and Lacerta agilis respectively, first convinced me of the homology of the parts of the cochlea in the two groups, as far as the results of my own observations were concerned. The chief differences are due to the fusion of the lagena and pars basilaris, to the elongation of the connecting canal, and to the forward and downward growth of the cochlear sac. The lagena is still anterior to the pars basilaris, and the sacculocochlear duct opens near the posterior medial border of the sacculus. The papilla basilaris becomes in the Reptiles of as much importance as the papilla lagenae. In some forms of the Lacertilia it already shows signs of obtaining the preponderance it possesses in the Crocodilia, in Birds, and in Mammals. I give here a diagrams illustrating the relationships of the parts in the two groups, Amphibia and Reptilia. It must be understood that it is only by considerable distortion that the parts can be repre- sented in one plane, and it seemed best to show an imaginary hori- zontal section of the pars inferior, although even in this case it is necessary to represent the parts of the cochlea as lying in the same horizontal plane as the sacculus. This affects the accuracy of the dia- gram more in the Reptilia than in the Amphibia, since in the former the cochlea lies mainly ventral to the sacculus. Anterior Posterior S '. Pb Ms- Pl Ppb Fig. 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 Anatomische Gesellschaft. Jena : G. Fischer
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