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THE POPULAR SCIENCE MONTHLY.
stomach is called the pyloric end, and it is made inside like a sieve or strainer. The sides are stuffed out in the centre like cushions, and quite covered with hairs (Fig. 25). Let us see why. Pylorus means gate-keeper. It protects or guards the intestine from all intruders,
![](http://upload.wikimedia.org/wikipedia/commons/thumb/8/89/PSM_V06_D602_Lobster_intestinal_diagram.jpg/450px-PSM_V06_D602_Lobster_intestinal_diagram.jpg)
Fig. 22.
such as big pieces of meat and hard bodies. None but the finest particles can pass through the strainer, and hence this pylorus is a very good gate-keeper. The intestine does not go wandering about in the body like the mussel's, but passes straight back (Fig. 22), and ends at the