SUMMARY OF CONCLUSIONS. 217 



true embryonic structures. And so, in the gamomorphic 

 stage, the representatives of the reproductive receptacles 

 must be sought for in certain organs of the body, often not 

 at all conspicuous, the spermaries and ovaries, or, perhaps, 

 rather the minute spermatic cysts and ovisacs which are 

 developed in their interior at the appropriate season. 



Hence, the formula, modified to the case of the higher 

 animals, would stand as follows : — 



I. — PROTOMORPHIC STAGE. 



Development of the fecundated germ into a peculiar 

 cellular mass, by a process of cleavage — ('' Mul- 

 berry body") 



Gemmation, or implantation of the primitive trace of 

 embryonic organization in the area pellucida of 

 this germinal mass. 



II. — ORTHOMORPHIC STAGE, 



Development of this primitive trace of organization, 

 through the successive stages of embryonic 

 growth, into the typical conformation of the 

 species. 



Gemmation, or formation, in the typical form, of a 

 matrix, which is subsequently to originate repro- 

 ductive organs of greater or less complexity — 

 ( Wolffian Body t) 



III. — GAMOMORPHIC STAGE. 



Development of the true organs of reproduction — 

 spermsacs and ovisacs. 



Gemmation or formation, in their interior, of vesicles of 

 evolution containing spermatozoa, and of ova 

 with germinal vesicles ; by the joint action of 



L 



