21(j SUMMARY OF CONCLUSIONS. 



2. If it is desired to have a formulated expression of 

 the sequence of phenomena in the genetic cycle, the follow- 

 ing may be taken as a sort of medium statement : 



I. PROTOMORPIIIC STAGE. 



Development of the fecundated Germ into a rudimen- 

 tary asexual organism, serving as the matrix of 

 the typical form. 



Gemmation, or formation in connection with this 

 matrix of one or more growths of a new and 

 different kind. (Scolex, Mediae.) 



II. ORTHOMORPHIC STAGE. 



Development of such a growth into an organism of the 



typical form of the species. 

 Gemmation, or formation in the typical organism of 



new points of growth, for the development of 



reproductive organs. 



III. GAMOMORPHIC STAGE. 



Development of the new growth into a more or less 

 complex structure, serving as a receptacle of true 

 sexual organs (Medusoid, Prothattium, &c.) 



Gemmation, or formation in such structures of sper- 

 matic and germinal bodies, the latter, on fecunda- 

 tion by the former, constituting the starting point 

 of a new cycle. 



3. In applying this formula to the case of the higher 

 species, the protomorphic matrix must be held as repre- 

 sented by the cellular mass, resulting from the cleavage of 

 the germ on impregnation, and serving as the basis of the 



