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Show 518 PROF. ST.-GEORGE MIVART ON THE iELUROIDEA. [June 6, The Auditory Ossicles. The malleus is the only ossicle which presents readily available classificatory characters. These have been examined and described by Mr. Alban Doran l. From an examination of the collection of ossicles in the Royal College of Surgeons, with the use of M r . Doran's paper, I have noted the following characters in the following groups:- s '•S •a 1 ss CO s s I ! Head large. Neck long and stout. Manubrium thick and curved. Processus brevis well marked. Processus muscularis very short, rather lower down. Articular surfaces may or may not have a groove running into a concavity. Head moderate. Lamina large. Neck long. Manubrium very slender. Processus brevis blunt. Processus muscularis rudimentary. Articular surfaces deeply cut; both are convex; and the groove runs into an internal concavity. Head very large. Lamina rudimentary. Neck short and stout. Manubrium broad and curved. Processus brevis well marked. Processus muscularis short, stout; springs not from neck, but from manubrium. Articular processes deeply cut; both are convex; and the groove runs into an internal concavity. Head moderate. Lamina large. Neck long. Manubrium slender and straight. Processus brevis blunt. Processus muscularis small, from neck. Articular surfaces deeply cut; both are convex; and the groove runs into an internal concavity. Head moderate. Lamina large. Neck long. Manubrium slender and straight. Processus brevis rather well marked and straight. Processus muscularis from neck, long and sickle-shaped. Articular surfaces deeply cut; the upper one flat, the lower one convex; the groove fades outwards. i-I ci co •* m cS~ t-' 1 Trans. Linn. Soc. new series, (Zoology) vol. i. p. 371. |