. Bulletin - United States National Museum. Science. ^ fy A 3 5 Fig. 18. Amhlystoma epixanthum, Atlanta, Idaho; \. This species is in all respects more robust than the A. macrodactylum, and is more brilliantly colored. Its tints are those of the European Salamandra maculosa^ and are brighter than those of any other species of the genus. Its hyoid apparatus is represented on Plate 23, fig. 8. CHONDEOTUS Cope. American Naturalist, 1687, p. 88 (January). Otoglossal cartilage triangular, attached by abase to each side of the hypobranchial cartilage. In other respects this genus agrees with Amblyst
. Bulletin - United States National Museum. Science. ^ fy A 3 5 Fig. 18. Amhlystoma epixanthum, Atlanta, Idaho; \. This species is in all respects more robust than the A. macrodactylum, and is more brilliantly colored. Its tints are those of the European Salamandra maculosa^ and are brighter than those of any other species of the genus. Its hyoid apparatus is represented on Plate 23, fig. 8. CHONDEOTUS Cope. American Naturalist, 1687, p. 88 (January). Otoglossal cartilage triangular, attached by abase to each side of the hypobranchial cartilage. In other respects this genus agrees with Amblystoma. The larva of the type species (0. tenebrosus), the only one I have identified, differs from those of Amblystoma in the absence of basal branchial processes, and of splenial teeth. (Plates 20-21.) I have examined the hyoid apparatus of five species of this genus, and I refer two others to it. One of these, G. cingulatus, very probably belongs here; the position of the other, G. texanus, is altogether uncer- tain as yet. Considered with respect to the forms of their otoglossal cartilages these species fall into three sections, as follows (see Plates 25 and 26): (1) The cartilage uninterrupted in front. G. tenebrosus, G. aterrimus, and G. decorticatus. (Figs. 1, 4-5, 8-9.) (2) The cartilage divided in front, and without median processes. G. paroticus. (Figs. 6-7.) (3) The cartilage divided, each half with an internal and external proc- ess in front. (Figs. 1-2, PI. 26.) G. microstomus. In addition to these characters, it may be observed that in the 0. tenebrosus and G. aterrimus there is a sheet of strong fibrous tissue extending anteriorly from the otoglossal cartilage, and forming the base of the tongue. A few similar fibers are found in the correspond- ing position in the A. 'paroticum. Besides the characters of the otoglossal cartilage I have already given, I may add that in the species with entire anterior border, the crest of the superior surface of the basibranchial ap
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