THE GASTRIC MILL. 55 
the hinder middle piece (pp) is connected with a second flat 
transverse plate which lies in the dorsal wall of the pyloric 
chamber (p). The whole arrangement, thus far, may be 
therefore compared to a large cross-bow and a small one, 
with the ends of their handles fastened together by a 
spring joint, in such a manner that the handle of the 
one makes an acute angle with the handle of the other ; 
while the middle of each bow is united with the middle of 
the other by the bent arm formed by the two handles. 
But, in addition to this, the outer ends of the two bows 
are also connected together. A small, curved, calcified 
bar (pc) passes from the outer end of the front crosspiece 
downwards and outwards in the wall of the stomach, and 
its hinder and lower extremity is articulated with another 
larger bar (zc) which runs upwards and backwards to 
the hinder or pyloric crosspiece, with which it articulates. 
Internally, this piece projects into the cardiac cavity of 
the stomach as a stout elongated reddish elevation (It), 
the surface of which is produced into a row of strong 
sharp, transverse ridges, which diminish in size from 
before backwards, and constitute a crushing surface 
almost like that of the grinder of an elephant. Thus, 
when the front part of the cardiac cavity is cut away, 
not only are the median teeth already mentioned seen, 
but, on each side of them, there is one of these long 
lateral teeth. 
There are two small pointed teeth, one under each 
of the lateral teeth, and each of these is supported by 
