. Elementary text-book of zoology. 514 CHORD AT A. The ox, on the other hand, starts from the bunodont type found in the pig, with four principal crowns. These do not unite transversely, but each independently becomes crescentic, producing the selenodont or crescentic type of molar. The crescents may unite longitudinally but not transversely. The study of the teeth of these two types shows that in this respect the ox is more specialised than the horse, a conclusion which agrees with the comparative structure of the stomach. The stomach of the horse is fairly simple ; it is at most constricted
. Elementary text-book of zoology. 514 CHORD AT A. The ox, on the other hand, starts from the bunodont type found in the pig, with four principal crowns. These do not unite transversely, but each independently becomes crescentic, producing the selenodont or crescentic type of molar. The crescents may unite longitudinally but not transversely. The study of the teeth of these two types shows that in this respect the ox is more specialised than the horse, a conclusion which agrees with the comparative structure of the stomach. The stomach of the horse is fairly simple ; it is at most constricted into cardiac and pyloric portions, whereas that of the ox has four distinct parts or chambers. Fig. 353.âStomach of a Ruminant, Showing Internal Structure. (Flower and Lvddeker.) ; I, Rumen (paunch) ; c. Reticulum (honeycomb) ; d, Psalterium â >.: /) (many-plies); e, Abomasum (reed) ; f. Duodenum. The rumen (or paunch) is a large and capacious sac for storage of food j the reticulum . (or honeycomb bag) is a small globose sac with reticulate walls: following this is the psalterium (or many-plies) with folded walls, sue-, ceeded by the abomasum (or reed) which is the true digestive stomach. The food is cropped and swallowed, passing down to the paunch, in which it is stored. After feeding, the animal retires to a secure retreat or at least comes to rest, and the food is passed by the reticulum up the oesophagus into the mouth. Here the process of. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Masterman, Arthur Thomas. Edinburgh, E. & S. Livingstone
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