. The anatomical record. Anatomy; Anatomy. The Anatomical Eecord. 85 Ganpp^^ and Iwanzoff.^- It is interesting to note at this point that the occxirrence of this muscle or its attachment to the sound-transmitting apparatus is not found in such forms as Necturus, Proteus, larval Ambystoma, etc., in which there is a squamoso-columellar connection. The '"bulla-like structure" mentioned above is composed entirely of an outpocketing of the ear capsule, the cavity of which is occupied by an extension of the cavum perilymphaticum. For purposes of the present paper we will speak of this as t
. The anatomical record. Anatomy; Anatomy. The Anatomical Eecord. 85 Ganpp^^ and Iwanzoff.^- It is interesting to note at this point that the occxirrence of this muscle or its attachment to the sound-transmitting apparatus is not found in such forms as Necturus, Proteus, larval Ambystoma, etc., in which there is a squamoso-columellar connection. The '"bulla-like structure" mentioned above is composed entirely of an outpocketing of the ear capsule, the cavity of which is occupied by an extension of the cavum perilymphaticum. For purposes of the present paper we will speak of this as the perilymphatic prominence,— in accordance with its external form. In the latero-ventral wall of the perilymphatic prominence is a foramen which for the present we desig-. FiG. 2.—Ambystoma punetatum, mature larva, 48 mm. long; section farther caiidacl: sq., squamosum; el., canalis lateralis; ec, ear capsule; vj., vena jugularis; Ic, ligamentum squamoso-columellare; col., columella. nate the secondary vestibular foramen in order that we may not confuse it with the primary foramen, of which it is doubtless an extension. This foramen is closed, by the above mentioned operculum. This is an entirely new development caudad and ventrad of the columella. The changes which come about in the sound-transmitting apparatus of Ambystoma at transformation show many striking resemblances to the development of the plectrum and operculum in the frog as described in the excellent monograph by Gaupp. A summarized statement of his results as there given is as follows: "Gaupp. E. Beitrage sur Morphologic des Schadels, I. Primordialcranlum und Kieferbogen von Kana fusca. Morphol. herausgegeben v. G. Scbwalbe. Bd. 2, 1893. "Iwanzoff. N. Zur Anatomie der Knochelcben des Mittel-Ohres d. Am- phlbien u. Reptilien. Anat. Anz., Bd. IX, Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appea
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