. The Columella auris in Amphibia. 596 B. F. Kingsbiiiy and H. D. Eeed. Amphiuma. In Amphiuma a single plate fills ttie fenestra vestibuli and is free except on its cephalic end where it is fused with the ear capsule which is cartilaginous. The very large stilus is articulated at its distal end with the squasmosum and continuous with a process of the palatoquadrate. Its relation to the facial nerve and blood vessels is typical. On both inner and outer surfaces of the fenestral plate there is a layer of bone (Fig. 18) which is continued for a short. Fig. 18. Auiphiuma means, adult. , canali
. The Columella auris in Amphibia. 596 B. F. Kingsbiiiy and H. D. Eeed. Amphiuma. In Amphiuma a single plate fills ttie fenestra vestibuli and is free except on its cephalic end where it is fused with the ear capsule which is cartilaginous. The very large stilus is articulated at its distal end with the squasmosum and continuous with a process of the palatoquadrate. Its relation to the facial nerve and blood vessels is typical. On both inner and outer surfaces of the fenestral plate there is a layer of bone (Fig. 18) which is continued for a short. Fig. 18. Auiphiuma means, adult. , canalis lateralis; Col., columella; Sq., OS squamosum; , stilus columellse; VII., nervus facialis. distance upon the base of the stilus. A distinct but not strong liga- mentum hyo-columellare is present. Its diagrammatic representa- tion is given in PL X, Fig. 71. The fenestral plate becomes narrower in its caudal third and finally tapers to a point. In that portion of the ear capsule forming the caudal margin of the fenestra there is a pronounced prominence within which there is a continuation of the perilymphatic cavity of the ear (Fig. 20). While complete developmental stages have not been studied, sec- tions through the head of a larva soon after hatching, a transform- ing individual and an adult furnish some data regarding develop- ment. In the youngest larva the fenestral plate is relatively small. 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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