. Comparative anatomy of vertebrates. Anatomy, Comparative; Vertebrates. 298 COMPARATIVE ANATOMY The first indications of a pars basilaris with its papilla basilaris lagcnce are already met with in certain Urodeles, but they lie inside the upper part of the lagena, close to the sacculus. In the Anura (Figs. 217 and 218) a higher condition is seen in the presence of a peculiar small outgrowth of the thickened wall of the lagena on which a definite region, supported by cartilage, corresponds to the basilar membrane of higher types. The lagena and pars basilaris now open close together but indepe
. Comparative anatomy of vertebrates. Anatomy, Comparative; Vertebrates. 298 COMPARATIVE ANATOMY The first indications of a pars basilaris with its papilla basilaris lagcnce are already met with in certain Urodeles, but they lie inside the upper part of the lagena, close to the sacculus. In the Anura (Figs. 217 and 218) a higher condition is seen in the presence of a peculiar small outgrowth of the thickened wall of the lagena on which a definite region, supported by cartilage, corresponds to the basilar membrane of higher types. The lagena and pars basilaris now open close together but independently of one another in the posterior part of the sacculus. Thus, in addition to those present in Fishes, a new patch of nerve-endings is added, viz., the papilla acustica basilaris lagcnce. The ductus endolymphaticus may give rise to large sac-like enlargements containing calcareous matter which meet those of the other side, either on the dorsal surface only, or on both dorsal and ventral surfaces of the brain. The latter is the case in Anura,. Ppl. 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 Wiedersheim, Robert, 1848-1923; Parker, W. N. (William Newton), d. 1923. London, Macmillan and co. , limited
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