65 



7, Alternation of generations occurs, A non-sexual 

 form of multiplication appears durinr; larval life; 

 buds are produced which are detached as planulae and 

 go through the same changes as the parent. 



8, The order and arrangement of tentacles in the go- 

 nosome follows a definite plan in cyclic sequence, 

 producing a figure which is cyclically (not bilater- 

 ally,: symmetrical. Tentacles and sense-organs ap- 

 pear at determinate points on the bell-margin, 



9, Histogenesis of tentacles and sense-organs sho'.vs 

 their homology, 



10, The origin of nematocysts from the ectodermal pad 



at the base of the tentacle, and tlieir homology with 

 cartilaginous concretions, are establis?ied, 



11. Cronads arise as enlargements by proliferation of the 

 ectodermal subumbral epithelium of the radial canal. 



