. The elasmobranch fishes . C D Fig. 237. Ear of Elasmobranchs. (From Retzius.) Squatina: A. Outer view of left ear. B. Inner view of right ear. Baja â ⢠C. Outer view of left ear. D. Inner view of right ear. (For explanation see fig. ) circular canals superficially. Two pairs of apertures may enter the capsule from the parietal fossa in the middorsal line. The first and smaller of these is for the endolymphatic ducts (, figs. 59 and 62), while the second and larger pair of apertures are the fenestrae (fn.). These apertures may be considered more in detail. I have previously mentione
. The elasmobranch fishes . C D Fig. 237. Ear of Elasmobranchs. (From Retzius.) Squatina: A. Outer view of left ear. B. Inner view of right ear. Baja â ⢠C. Outer view of left ear. D. Inner view of right ear. (For explanation see fig. ) circular canals superficially. Two pairs of apertures may enter the capsule from the parietal fossa in the middorsal line. The first and smaller of these is for the endolymphatic ducts (, figs. 59 and 62), while the second and larger pair of apertures are the fenestrae (fn.). These apertures may be considered more in detail. I have previously mentioned fenestrae for a number of sharks and for some of the rays (p. 55). If we refer to figures of the dorsal view of the skull (figs. 59 and 62) we observe that these openings are well marked and take up their
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