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In making the section of the bones, the saw ought to be applied to the humerus transversely just at the commencement of its condyloid projections, and to the radius and ulna, at least at a level with the base of the coronoid process of the ulna.

Kinds of Movable Joints.—The different kinds of movable joints are the ball and socket joint, the hinge joint, the pivot joint, the condyloid joint, and the gliding joint.

Examples of condyloid joints are found at the knuckles and where the wrist bones articulate with the radius and ulna.

Since publishing my little volume I have got several new plates of Asterolepis,—a broad palatal plate, covered with tubercles, considerably larger than those of the creature's external surface,—a key-stone shaped plate, placed, when in situ, in advance of the little plate between the eyes, which form the head and face of the effigy in the centre of the buckler,—and a side-plate, into which the condyloid processes of the lower jaw were articulated, and which exhibited the processes on which these hinged.