PLATE 6 



EXPLANATION OF FIGURE 



Figure 13, drawn by Miss Brinton from an early stage of the third period of 

 R. catesbiana (7 mm.) demonstrates definite longitudinal ducts in place of the 

 heart plexus. The dorsal lymphatics connect with these heart vessels as before, 

 and the main caudal ducts have grown nearly to the end of the tail. The anterior 

 lymphatics show considerable growth to the periphery, and the temporal division 

 of the jugular lymphatic is dilated. 



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