h'T??Ti;. -■; 



35. Tlie leaflike flatworm, Pseudoceros, which has many drab-colored polyclad rela- 

 tives in temperate marine waters, shows the gay coloring common in tropical animals. 

 (Great Barrier Reef. Fritz Goro: Life Magazine) 



37. A marine ribbon worm. Tiihulanus poh/iiioiplnis. exposed 

 at low tide. Stretched out, it measured 6 feet. (Oregon. Ralph 

 Buchshauni) 



36. A dense aggregation of minute acoel flatworms, 

 Convohita roscoffensis, shown much enlarged. When 

 the worms rise to the surface sand at low tide, they 

 expose to the sun the green algal cells that pack their 

 bodies. (Roscoff, France. Ralph Buchshaum) 



