. Anatomischer Anzeiger. Anatomy, Comparative. 187 P[fTHODO/V GIVTINOSVS. I under the genus Spelerpes. For the purpose of studying the pharyngeal mucous membrane the pharynx was dissected out from the specimen shown in Fig. 1, opened along the mid-dorsal line and pinned back (Fig. 5). The only indication of a glottis was a slight puckering of the mucous folds about a certain region, a, where a little depression is visible. The extreme depth of this depression is seen in Fig. 2. In my former paper on lungless Salamanders, in referring to Plethodon I wrote that "die Glottisein- stülpung ist
. Anatomischer Anzeiger. Anatomy, Comparative. 187 P[fTHODO/V GIVTINOSVS. I under the genus Spelerpes. For the purpose of studying the pharyngeal mucous membrane the pharynx was dissected out from the specimen shown in Fig. 1, opened along the mid-dorsal line and pinned back (Fig. 5). The only indication of a glottis was a slight puckering of the mucous folds about a certain region, a, where a little depression is visible. The extreme depth of this depression is seen in Fig. 2. In my former paper on lungless Salamanders, in referring to Plethodon I wrote that "die Glottisein- stülpung ist kaum von den anderen Schleimhautfalten zu unterscheiden" and stated that it was more marked in Des- mognathus. It seems now that the rudi- Fig. 5. Pharynx of Plethodon glutino- s u s, opened along the inid-dorsal line and pinned back to show its internal folds, a Glottis region. b Oesophagus, c Stomach. mentary glottis invagination is shown about equally in the two genera, the reason of my former conclusion being that the series used, which was the one referred to at the beginning of this description, as the one made from the piece cut out, did not extend far enough anteriorly, since the invagination is unusually high up. It is always very difficult to prove that a thing does not exist and in this investigation I have made my series whenever possible extend in both directions far be- yond the possible limits of larynx-rudiments. In this genus in the region of the glottis fold a very thin sheet of striated muscular fibres is spread out over the pharynx ventrally. These were overlooked in the first dissection, and seen first in the serial sections of P. cinereus (Fig. 2). Later on I succeeded in demon- strating them in a dissection of P. cinereus. They consist of very fine fibres, meeting in the middle line and diverging anteriorly. They lie directly upon the wall of the pharynx and beneath the hyoid ap- paratus. They do not seem to be present in the other genera. A farthe
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