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Show 190 MR. A. H. GARROD ON THE [Feb. 1, The disproportionately massive appearance of the legs is also caused by the presence of air beneath the tessellated skin, which extends almost to the ungual phalanges of the toes. The contour-feathers, many of them, possess a very feeble after-shaft, especially in the region of the nape, as found by Nitzsch in C. chavaria ; and there is also a slight groove along the posterior surface of the rhachis of each. The rectrices are twelve in number. There are twenty-six remiges in one of m y specimens ; Nitzsch and Sundevall find twenty-seven. Of these ten are primaries, the fourth being the largest. Of the sixteen secondaries the distal twelve are subequal, whilst the proximal four decrease in size as they approach the elbow. The tufted oil-gland is not strikingly large; it is somewhat flat, with a single orifice on each side, surrounded by a circle of half-inch feathers which constitute the tuft. The tibio-tarsus is nude for its distal third, being there covered, as over the tarso-metatarse and digits, with small red polygonal scales. The plumage is uninterrupted, there being no spaces without contour-feathers except the axillary cavities mentioned by Nitzsch, in which down-feathers only are to be found. The down-feathers are universally distributed. The nude neck-ring of C. chavaria is absent in C. derbiana. The feathers of the humeral tracts are considerably the strongest of the contour-feathers. Looked at in its entirety the pterylosis of the Screamers is unique, and in no way approaches that of the Anserine birds. Alimentary Canal.-The palate is elongate and triangular, with three longitudinal rows of papillae, which are conical, large, and therefore comparatively few in front, smaller and more numerous behind. They all tend somewhat backwards. The tongue is just over an inch long, and | of an inch broad, its sides being parallel for nearly their whole length. The tip is obtusely triangular, with a small papillary fringe at its extremity, g of an inch broad. The base is straight, and is edged with spines Ay of an inch long, and shorter, directed backwards. The surface and lateral margins are quite smooth, the whole organ being flattened, slightly grooved longitudinally down the centre, and nowhere more than g of an inch thick. At its base are two lateral juxtaposed protuberances, rough on the surface, and together equal in area to one third of its surface. There is no transverse constriction or oblique groove like that found on the surface of the tongue in some Anatidae. The ozsophagus is uniform in diameter, no crop being even indicated ; it is not capacious. The proventriculus is peculiar. It is more than usually capacious, and is glandular only in a patch which occupies but a small portion of its surface. This patch (which is clearly shown in the representation of this portion of the alimentary canal in Plate XII. fig. 1, at its upper end, where the proventricular dilatation ceases) has a |