C(ELENTERATA. 



177 



it about that every polyp in the colony is connected with the digestive 

 cavity of every other, and there is a possibility of co-operative 

 nutrition not often found in colonies. 



In some of these simpler colonies all the budded individuals are 

 much alike; but in some of the complex ones the buds may become 

 different and do different work for the colony. Some may capture 



FIG. 49- Physalia, the Portuguese man-of-war. After Agassiz. 



Questions on the Figure. For what is this animal remarkable? 

 To what group of coelenterates does it belong? Compare Huxley's 

 figure of the same animal (see Parker and HaswelJ's Zoology, Vol. I, 

 p. 152, and other reference texts). What various types of polyps 

 are represented in the colony? Compare this condition with the 

 diagram in Fig. 48. 

 12 



