EDUARD UHLENHUTH 



531 



Fig. 1. 



Fig. 2. 



Fig. 3. 



Fig. 4. 



Fig. 1. Opaciim 1916, A 4. Worm-fed metamorphosed animal, 2 days after 

 metamorphosis; gray network visible on the snout; rows of larval spots still 

 present. 



Fig. 2. Opacum 1916, A 3. Worm-fed metamorphosed animal, 2 weeks and 

 3 days after metamorphosis. Gray network fully developed, but rows of larval 

 spots still present on back. 



Fig. 3. Opacum 1916, A 3. Worm-fed metamorphosed animal, 6 weeks 

 after metamorphosis. Gray network fully developed, rows of larval spots have 

 disappeared. 



Fig. 4. Opacum 1916, F 3. Thymus-fed larva. Gray network fully devel- 

 oped; rows of larval spots have disappeared. 



