i6 



SPONGES 



individual may acquire as the result of its particular mode of 

 growth, it remains to discuss the forms assumed as the result of 

 multiplication of individuals which remain united. Since the 



*^Bi-"•-■•'®5/I!^-t[•U;V--'^\■^v.■:;s^--^ 



Fio. i-z. 

 AphrocuUiMes Bocagei, Wright. (After Aga.ssiz.) x J. 



sponge colony consists of an aggregation of sponge individuals, pro- 

 duced one from another by a i)rocess of budding, its form Avill 

 depend largely in the first instance on the type of sponge persons 





^'Skiuv^i^il/ 



m 



Vfntrieiilitf.i, iinn);iii<>d ri'coiistnictioii. r, root-like processes of attachniPiit ; osr, oseuluni. 

 A pif'ce of the nmrgiii is represeiiteU broken away to show the plicntion.s which form tlie in- 

 current and excurreiit canals. 



of which it is composed. Tlie other factors whicii influence the 

 form of the colony are, first, the way in which the individuals are 

 united together — that is to say, the manner in which they are budded 



