THE GASTKIC 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, calcined 

 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 bj 



