PLATE 3 



EXPLANATION OF FIGURES 



The two figures on this plate represent injections of the second period (K. 

 palustris), figure 3, an early stage of the lymph heart plexus, extended along the 

 lateral surface of the anterior segments, quite unlike veins. The first three inter- 

 segmental veins are well injected deep to the plexus, but other veins and arteries 

 are shown faintly in the deep tissues. Figure 4, a later stage of the same period, 

 is somewhat magnified to shown in more detail, the characters of the lymph heart 

 plexus and its extended anterior processes. The lymphatics are recognized as 

 unlike veins. The second and third veins are injected deep to the heart, which 

 opens into the latter vein. 



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