248 HOMOLOGICAL RELATIONS OF THE 



monoecious, in which they are of separate sexes ; and 

 another, again, dioecious, in which those of one sex only are 

 derived from the same axis or polype stock. It is believed 

 that illustrations of all these arrangements may be found 

 in the two groups referred to, as well, perhaps, as in some 

 others. 



The sexual relations, now indicated, may be represented 

 in a tabular form as follows : — 



Reproductive Organs present, as integral parts of the system : — 

 Male and Female in different indivi- 

 duals, each of wliicli is IMonosexual. 



Male and Female in the same indivi- 



( Bi-sexual or 

 dual, which is, therefore | Hermaphrodite, 



but not necessarily seK-impregnatmg. 

 Organs appearing as distinct gemm{?e : — 



Male and Female in the same gemma. . . Synoecious. 

 Male and Female in different gemmae, 



from the same stock , Monoecious. 



Male and Female in different gemmte, 



from different stocks Dioecious. 



Organisms, normally incapacitated for sexual 



action, are termed... Neuter. 



True neuters occur only in the preli- 

 minary phases of species which 

 have the sexual organs in detached 

 gemnise ; 



False neuters are either rudimentary 

 or larval conditions of organisms 

 which afterwards form true sexual 



organs ; 



Or, individuals in wliich the latter re- 

 main permanently in a rudimen- 

 tary condition, as in the female 

 working Bees. 



§ 5. It is with some hesitation that I have used the 

 term homologous with reference to the correspondences 

 above suggested, as they are obviously of a different nature 



