. Fig. 3. Wing of Dexia canina. The niediastinal vein is generally near to the base connected with the costal vein by a cross-vein, the basal cross-vein, and then there are two costal cells. The radial vein is often unbranched, but may be branched, and then there is more than one subcostal cell; the subcostal cell or cells lie between the convex subcostal vein and the concave radial vein, or between the branches of the latter. The cubital vein is generally branched and there may be up to three cubital cells; the cubital cells lie between the concave radial vein and the convex

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