. Anatomischer Anzeiger. Anatomy, Comparative; Anatomy, Comparative. 605 lie at the side of the back part of the tongue, as shown in figure 2, which may be compared with figure 13, as of a nearly comparable level in a nearly transformed larva. The development of the adult tongue causes a piling up of the epithelium in this region with a marked attend- ing histolysis, so that it is not easy to determine what point of morphogenetic correlation there may be between the appearance of the tonsils and the transformations at metamorphosis, as the region is difficult of analysis and this is true notwi
. Anatomischer Anzeiger. Anatomy, Comparative; Anatomy, Comparative. 605 lie at the side of the back part of the tongue, as shown in figure 2, which may be compared with figure 13, as of a nearly comparable level in a nearly transformed larva. The development of the adult tongue causes a piling up of the epithelium in this region with a marked attend- ing histolysis, so that it is not easy to determine what point of morphogenetic correlation there may be between the appearance of the tonsils and the transformations at metamorphosis, as the region is difficult of analysis and this is true notwithstanding the fact that the sublingual tonsils are, after the preglottideal tonsils, the most constant in occurrance and location. In the toad, while the morphological relations are in some respects more complex, nevertheless because of its constancy, it is possible to locate more ex- actly the point at which the sublin- gual tonsil appe- ars (Fig. 14). It is thus found to be at the cephalic end of the furrow (II) leading for- ward from the branchial cham- ber. The devel- opment of the tongue, while proceeding in anura essentially as in urodela, does not, directly at least, influence the transformations in the tonsillar region. Hence, also there is little doubt as to the interpretation in Salamandra. Other A nip hibia. While a detailed study of the tonsils in other urodela amphibia has not been made, enough has been done to indicate clearly that the regions in which tonsils occur in Salamandra atra are also those in which they occur in other salamanders. Thus in a single adult specimen of Desmognathus fusca were found (1) lateral tonsils, double on each side, apparently representing III (b) and (c); (2) paired sublingual tonsils in the typical position over the expanded ceratohyals; (3) a conjunctival tonsil upon the right side. A preglotti- deal tonsil was lacking and this was rather to be expected since the glottis itself is lacking, this form being one of the lungless salam
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Keywords: ., bookcentury1900, bookdecade1910, bookpublisherjenag, bookyear1912
