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Show 142 MR. P. CHALMERS MITCHELL ON THE [Jan. 14, is longer than the others, as frequently happens when the caeca are relatively short. It is drained partly by the duodenal vein. Fig. 5. Colymbus scptentrioualis ; intestinal tract, x, short-circuiting vessel from duodenal to posterior mesenteric vein cut across. The last part of the intestine is long and straight, and the posterior mesenteric vein drains the caeca and part of the region in front of the caeca. SPHENISCIFORMES. In these (fig. 6) the primitive arrangement is disguised by the enormous length of the gut and consequent complexity of the Fig. 6. Eudyptes chrysocome; intestinal tract, x, short-circuiting vessel cut |
