268 APPENDIX. 



TABLE XII. 

 GENETIC CYCLE OF THE SALP^E. 



PROTOMORPHIC STAGE, 



(merged in the following). 

 The primordial Germ-mass. 



ORTHOMORPHIC STAGE. 



The Embryo, transformed into 

 The solitary Salpa. 



GAMOMORPHIC STAGE. 



Catenated Salpce. 



Spermary, Ovary. 



Primary Sperm Cell, Ovum. 



Special Sperm Cells ^ ( Germinal Vesicle 

 and Spermatozoa. ) ( and Macula. 



FECUNDATION. 



TABLE XIII. 

 GENETIC CYCLE OF THE TREMATODA. 



PROTOMORPHIC STAGE. 



The Infusorial Germ. 

 The primary Gregarinif orm Zooid (Eedia or Sporocyst. ) 



[The secondary Gregariniform Zooid]. 



ORTHOMORPHIC STAGE. 



Cercaria, penetrating into the tissues of animals. 



The same encysted, 

 And then metamorphosed into a Distoma. 



GAMOMORPHIC STAGE, 



(distinguished from the former by the acquisition of sexual organs). 

 Spermary, Ovary. 



Primary Sperm Cell, Ovum. 



Special Sperm Cells ) ( Germinal Vesicle 

 and Spermatozoa. j (. and Macula. 



FECUNDATION. 



