GROWTH OF THE CORAL COLONY 73 



as a rounded boulder. This boulder-form is a very common 

 type of -vegetative growth among the reef-building corals ; for 

 if the growth starts as a perfect sphere, it will ultimately 

 assume this form, and if the colony starts its growth on a 



Fig. 11. 



A GrROWTH -OF PoviteS 



In which the colony has grown as an approximation to a sphere. 



basis that is not an isolated fragment, it will start this mode 

 of growth from its first beginning. 



There are many different ways in which the asexual 

 reproduction of the zooids is carried out, for the budding and 

 division may proceed in various fashions. The principal types 

 of budding vary from each other in the actual site of origin 

 of the daughter zooid from the parent, and in the degree of 

 the final separation of the two zooids. These types, I think, 

 do not merit individual description here, for what was said 



