E. J. LUND 



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Fig. 1 /, Outline drawing from dorsal side of Bursaria, to show position of 

 the oral pouch in the body, and the paths of variously rejected and accepted 

 particles. A, path of total rejection; B, path of rejection of large particles which 

 are too large to pass out bj' way of the oral sinus, S. Ci and d, paths of rejection 

 of small particles; these pass out by way of the oral sinus, S; D, path of accept- 

 ance. II, Outline drawing of sagittal section, in the plane through the body 

 represented by the straight line through /. A, path of total rejection; D, path 

 of entrance of all particles taken into the oral pouch, same as first part of path 

 D, I. C, path of rejection of small particles, same as Ci and C2 of /. E, I the 

 same as E II, direction of rejected particles, C, I, and Ci, C2, II- 



part of their former path; some pass up into the proximal end 

 of the oral pouch but are rejected and returned to the outside 

 by way of the continuous arrows Ci. All the paths of rejection 

 under Ci and C2 converge and lead to the exterior by way of 

 the oral sinus, figure 1, / and II S.; they then pass backward 

 under the posterior ventral side, as shown by arrows E. There 

 is but one path of acceptance for both large and small particles. 



