RESEARCH ON THE DIGESTIVE SYSTEM OF THE SCHIZOPODA IQ 



stomach, we observe that the latéral plates, S, are projected into the cavity 

 in such a manner as to form concave internai surfaces covered with fine 

 hairs w^hich take an oblique direction. 



Their anterior borders are fringed with stiff spines. 



The posterior borders bear a cluster of teeth, /. 



The plates, 5, terminate with the reliefs which bear the teeth ; aband, 

 br, formed by a slightly raised epithelium covered with a chitinous cuticle 

 connects the plates with a ridge, 5, s, which passes above the pyloric cavity. 



At the level in which fig. il has been taken, the plates are somewhat 

 separated from one another. 



A. short distance in front of the plates a slight élévation of the cuticle 

 is seen in this and the two following figures. 



Where thèse eminences project into the cavity, the latter is somewhat 

 contracted . 



Fig. 12 is a section taken a little lower than the last. 



Each plate almost occupies a half of the diameter of the cavity, and 

 are consequently brought close to one another, their internai surfaces being 

 almost horizontal. The hairs and spines préserve the some dispositions as 

 in the last figure. The teeth are no longer seen, but in their place a range 

 of long hairs are found which take an oblique direction. 



The pièce terminâtes at b}\ which is a short band Connecting the pièce 

 S, with another ridge 5, / which like the ridge S, s runs over the pyloric 

 chamber. 



In FIG. 13, which is a section taken at a still lower level, the internai 

 surfaces of the plates are slightly concave. 



The two chambers of the stomach are no longer in communication. 



Between the two a ridge, c, is seen covered with fine hairs. 



The longitudinal aspect of this ridge is seen in fig. 3, c. 

 . in fig. 14 the lower borders of the plates are seen just above the 

 œsophagus. 



A pair of striated muscular bands connect them with the external latéral 

 integument. 



We pass now to the transverse sections. 



Fig. 4 is a section passing through the plane indicated by the same 

 number in fig. 3. 



The internai faces of the plates are inserted at an angle of 45° with the 

 médian plane. 



