240 HOMOLOGICAL RELATIONS OF THE 



In the Tunicata, by a catenated zooid, as in 



Salpa. 



In Annelida, by a caudal zooid, as in Syllis. 

 In Animals generally, by the spermary and ovary. 



The sperm-sacs and germ-sacs are represented 

 In the Protophyta, by the conjugating cells. 

 In Algse, by the antheridium and the sporangium. 

 In Fungi and Lichens, by the spermagonium and 



ascus. 

 In the higher Cryptogamia, by the antheridium and 



archegonium. 

 In the Phanerogamia, by the pollen -tube, and the 



embryosac of the ovule. 

 In Animals generally, by the primary sperm-cell 



and ovum. 



The ultimate sexual elements are represented 



In the Protophyta, by the endochrome of the con- 

 jugating cells. 



In Algae, by the antherozoids and germinal corpus- 

 cules. 



In Fungi and Lichens, by spermatia and endothecal 

 nuclei. 



In the higher Cryptogamia, by the filaments in the 

 cellules of the antheridia, and the central cor- 

 puscule of the archegonium. 



In the Phanerogamia, by the fovilla in the pollen- 

 tube, and the germinal corpuscules of the 

 embryosac. 



In Animals generally, by the spermatozoa in the 

 vesicles of evolution, and the macula of the 

 germinal vesicle. 



Tabular views are given in the Appendix of the points of 

 correspondence as above indicated. 



