PLATE 13 



EXPLANATION OP FIGURES 



Figura 28 is from a 15-mm. larva of R. palustris, drawn to show the manner 

 in which the anterior lymphatics of the body wall branch around the heart in two 

 groups, the anterior group over the pronephros connected with the jugular lym- 

 phatic, while the posterior vessels are branches from the lateral body lymphatic 

 just behind the heart. The dorsal reception duct is shown arching over the 

 anterior lymph heart. 



Figure 29 on this plate is an illustration of an 18-mm. larva of E. palustris, 

 demonstrating the manner in which the definitive lateral body lymphatic is formed 

 by fusion of the early lateral and ventral ducts in a common plexus. 



114 



