. The anatomy of the frog. Frogs -- Anatomy; Amphibians -- Anatomy. 28 THE BOXES ANI» JOINTS. Fig. 14/7 anterior end of the maxillary bone ; from the same spot a horn- shaped cartilaginous process {%', n'") cairves round backwards and towards the middle line. This projection bounds the nasal cavity externally, sending- off a free process ('?'") on the way, and ends with a double point on the roof of the carti- laginous nasal cavity {n""). On the floor of the nasal capsule, on either side, is a knob- shajDcd cartilaginous eminence, running' from behind, forwards and outwards
. The anatomy of the frog. Frogs -- Anatomy; Amphibians -- Anatomy. 28 THE BOXES ANI» JOINTS. Fig. 14/7 anterior end of the maxillary bone ; from the same spot a horn- shaped cartilaginous process {%', n'") cairves round backwards and towards the middle line. This projection bounds the nasal cavity externally, sending- off a free process ('?'") on the way, and ends with a double point on the roof of the carti- laginous nasal cavity {n""). On the floor of the nasal capsule, on either side, is a knob- shajDcd cartilaginous eminence, running' from behind, forwards and outwards; this may be reg'arded as an in- dication of a turbinated bone. From the an- terior wall there passes into each nasal cavity an almost horizontal, partly ossified plate ((?.«.),ending posteriorly in a free pointed bor- der. These are the, cornets of Duges (/. c, p. 12, PI. I, Figs. I, 5), who correctly re- garded them as tur- binated bones. Cuvier described them as rudi- mentary nasal bones ^, The alar cartilages of the nose have still to be described. They are {) shell-shaped cartilages, hollowed out on the inner sides and 1 Cuvier (Ossem. fossil., V, 2. 388) says that these little bones are fixed outside the nasal cavity, so that \fe may suppose that he confounded them with the nasal cartilages found in this situation. Duges correctly indicates their position to be inside of the nasal capsule. Meckel (Vergl. Anat. II, 504) also regards them as nasal bones. Bruch (Wurzb. naturwiss. Zeitschrift, vol. II, 1861, p. 213) could not find them in any frog-skull, doubtless because he did not look inside the nasal Cartilaginous basis of tlie skiill of Rana esculcnia, from above, twice natural size. Cartilage shown by stippling. Prootic. Anterior arm of pterygoid. Posterior arm of ptery- goid. Cartilaginous cranium. Cartilage of suspensorium. Cartilage under the squa- mosal. Cartilage under the ptery- goid. Anterior -, „ ,, -,.,,, I arm of the Middle > , _ ^ . I s
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