. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. DE VILLIERS: ASCAPHUS TRUEI STEJNEGER 29 the ganglion acusticum anterius and proceeds to the large macula sacculi of the pars inferior sacculi. (It may be stated here en passant, that the pars superior is absent in Ascaphus!) In Rana the nerve for the macula sacculi is a branch of the anterior ramus of VIII, so that the conditions in Ascaphus are quite in accord with comparative ThX/CJvZ. ^^i^ 1- 0 , 3ik^—c^j "'^1 ^ flo^ Fig. 11. Transverse section through the head of Ascaphus to show the de- tails of the posteri
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. DE VILLIERS: ASCAPHUS TRUEI STEJNEGER 29 the ganglion acusticum anterius and proceeds to the large macula sacculi of the pars inferior sacculi. (It may be stated here en passant, that the pars superior is absent in Ascaphus!) In Rana the nerve for the macula sacculi is a branch of the anterior ramus of VIII, so that the conditions in Ascaphus are quite in accord with comparative ThX/CJvZ. ^^i^ 1- 0 , 3ik^—c^j "'^1 ^ flo^ Fig. 11. Transverse section through the head of Ascaphus to show the de- tails of the posterior portion of the inner ear. (This figure represents a section situated not far posterior to Fig. 7D.) dhz = ductus horizontalis; dprl = ductus perilymphaticus; dps = ductus posterior; lag = lagena; racp 1 and racp 2 = branches of the ramus acusticus posterior; utr = utriculus. Other abbrevia- tions as for previous figures. anatomy. The ganglion acusticum posterius is situated on the laby- rinth side of the foramen acusticum posterius and appears in section at the niveau of the sinus superior utriculi. In the frog the ganglion gives origin to a nerve supplying the lagena and another supplying the pars basilaris and the posterior ampulla. In Ascaphus the ramus acusticus posterior also has two branches (Fig. 11), one of which sup-. 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 Harvard University. Museum of Comparative Zoology. Cambridge, Mass. : The Museum
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