. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. Mucus membrane of the interior of the pyloric caecum of a Herring (Clupcea harengus). A, the surface seen vertically, showing the honey- comb appearance formed by the septa separating the masses of epithelium. (Magnified 150 dia- meters.) B, a section vertical to the surface, showing the flattened spheroidal shape of the acuvuli of epithe- lium, and the amount of projection of the septa between them. (Magnified CO diameters.) folds of thegastro-hepatic omentum, enveloping the cystic canal and accompanying it as far as th
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. Mucus membrane of the interior of the pyloric caecum of a Herring (Clupcea harengus). A, the surface seen vertically, showing the honey- comb appearance formed by the septa separating the masses of epithelium. (Magnified 150 dia- meters.) B, a section vertical to the surface, showing the flattened spheroidal shape of the acuvuli of epithe- lium, and the amount of projection of the septa between them. (Magnified CO diameters.) folds of thegastro-hepatic omentum, enveloping the cystic canal and accompanying it as far as the intestine. These three examples of mala- cocopterygious fish have no pyloric caeca, and this glandular structure might be considered as replacing them ; but Alessandrini has also de- scribed in the sturgeon, the walls of whose in- testinal canal are particularly glandulous and in which the pancreatic cseca form an elaborate apparatus, a proper pancreas with an excretory duct opening into the intestine in the middle of a tubiform papilla about an inch from the pyloric orifice. In this last case Cuvier be- lieved the bod}' indicated as the pancreas to be a lobe of the liver. " The tubiform pa- pilla," he says, " truly exists ; indeed I have found two, besides that appertaining to the choledoch duct. In one of the examples it formed a sort of cul-de-sac; in the other the fibre which was introduced conducted to a canal which took a direction towards the liver. I have clearly seen an excretory duct in a very large silurus, piercing the intestine of the side of the choledoch ; but that canal was, in my opinion, hepatic, for the glandular substance taken as the pancreas was evidently continuous with the right lobe of the liver, and formed, as it were, a middle lobe ; its appearance was in other respects the same, except that its colour was rather clearer in consequence of its substance being less thick at that part. The duct discovered in the pike certainly exists, a
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