RESEARCH ON THE DIGESTIVE SYSTEM OF THE SCHIZOPODA 2 5 



Curved Unes are seen running in an oblique direction along the length of 

 the plates, not unlike the ridges of the grooves seen in the pièce S^, but in 

 the paired plates they are much more numerous, fig. 9, /-. Between the 

 lines an infinité number of transverse striations are seen. 



The longitudinal lines are found to be thickenings of the cuticle on the 

 internai surfaces of the plates in the form of ribs, which carry an infinité 

 number of fine hairs, fig. 13, 14, 15, 16. 



They are therefore comb-like formations. 



It is to be noticed that they do not run parallel to the ridges of the 

 grooves in the pièce 5,. 



The direction in which they run is seen in fig. 9, r, gr. 



The pyloric chamber is remarkable, therefore, for the number ofspines 

 and hairs that it contains and for the comb-like formation on the surfaces 

 of the plates 5^ and 5^. 



Our dissections show that much food matter reduced to very fine 

 particles is arrcsted by the hairs and spines in the cavity. 



Union of the pyloric chamber tvith the intestine. 



Not far from the intestine the upper portions of the latéral plates S^, 

 with the folds S,s, SJ, become detached from the walls of the cavity, and 

 their free terminal portions much reduced in size, bridge over the posterior 

 end of the cavity as far as the epithelium of the intestine, fig. 12, 13, 

 17, 19, P./.. 



The free upper portions of the plates S,, with the folds 5,/ united in 

 paired pièces are seen in fig. 12. 



Their terminal borders, rounded oflf, are fringed with long spines. ' 



It is, doubless, a filter apparatus to prevent the larger pièces of food 

 that hâve not been thoroughly masticated from falling into the pyloric 

 cavity behind the terminal surface of the pièce 5j. 



At the same time, the basai portions of the plates S„_ rise in an oblique 

 direction and become a pair of thin chitinous plates, fig. 16, P,/,. At their 

 base, they place themselves in front of the posterior surface of the pièce 

 5^, being still attached to the body wall. Then they become free and 

 project backwards with the upper pièces of 5,, PJ„ fig. 19. 



In FIG. 16 which has been eut at an angle of 43° to the axis of the 

 animal, thèse plates are shown facing the posterior surface of the pièce S,. 



