. The Columella auris in Amphibia. 586 B. F. Kingsbury and II. D. Reed, Desmognathus possesses a short but well developed ligamentum hjo-columellare, in this respect also agreeing with many of the Ple- thodentidse. In Fig. 13 it is indicated in the larva. Typhlomolge. A single adult 95 mm. long was studied by means of serial sec- tions and a model of the entire skull in the otic region. The fenestra vestibuli is filled by a single plate as in the Plethodontidse, connected by a long and slender stilus with the suspensorium. On the cephalo- ventral margin the fenestral plate is fused with the ea
. The Columella auris in Amphibia. 586 B. F. Kingsbury and II. D. Reed, Desmognathus possesses a short but well developed ligamentum hjo-columellare, in this respect also agreeing with many of the Ple- thodentidse. In Fig. 13 it is indicated in the larva. Typhlomolge. A single adult 95 mm. long was studied by means of serial sec- tions and a model of the entire skull in the otic region. The fenestra vestibuli is filled by a single plate as in the Plethodontidse, connected by a long and slender stilus with the suspensorium. On the cephalo- ventral margin the fenestral plate is fused with the ear Fig. 15. Desmognathus fusca, adult. , cavum perilymphaticum; M.( musculus opercularis; Op., operculum; , Recessus perilympliaticus. The stilus is relatively longer than in any of the other forms exam- ined. This is probably due to the extreme flattening of the skull, which has brought the long axis of the suspensorium more nearly parallel with that of the skull, thus throwing the attachment of the stilus to the suspensorium farther cephalad. It seems likely that this flat condition of the head is the result of an adaptation to sub-. 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 Kingsbury, Benjamin Freeman, 1872-1946; Reed, H. D.
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