. Dissection of the platana and the frog. Xenopus laevis; Rana fuscigula. Mouth Cavity. Open the mouth cavity widely, and make a sketch showing :— (a) The teeth on the upper jaw. (b) There are no teeth on the vomer. [In the Frog each vomer is supplied with teeth.] (c) The internal openings of the nostrils. (d) The single opening of the Eustachian tubes. [In the Frog there is an opening on each side.] (e) There is no tongue. [A tongue is present in the Frog.] (/) The glottis. (g) The gullet. Owing to the complexity of the Eustachian tubes and the bony form of the ear cavity, it is not possible


. Dissection of the platana and the frog. Xenopus laevis; Rana fuscigula. Mouth Cavity. Open the mouth cavity widely, and make a sketch showing :— (a) The teeth on the upper jaw. (b) There are no teeth on the vomer. [In the Frog each vomer is supplied with teeth.] (c) The internal openings of the nostrils. (d) The single opening of the Eustachian tubes. [In the Frog there is an opening on each side.] (e) There is no tongue. [A tongue is present in the Frog.] (/) The glottis. (g) The gullet. Owing to the complexity of the Eustachian tubes and the bony form of the ear cavity, it is not possible to pass a seeker from the Eustachian aperture through the tympanic membrane. [In the Frog the Eustachian tubes are short and straight and permit of this being done.] Vomerine teeth. Teeth on Upper Jaw Internal nares Eustachian aperture —• Gullet Glottis Tongue Fig-. 2.—Month cavity of Xenopus and 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 Gilchrist, J. D. F. (John Dow Fisher), 1866-; Bonde, C. von; University of Cape Town. Zoological Dept. Cape town : University of Cape Town, Zoological Department


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Keywords: ., bookcentury1900, bookcollectionbiod, bookdecade1910, bookyear1919