THE CLAVIFORM POLYPES. 37 



which occupy the extremities of the branches, are of the 

 same shape as the polype of the stem, and must be re- 

 garded as of the same kind, although they appear to arise 

 from it by what is called gemmation. 



Numerous observations abeady recorded justify us in 

 assuming that the account of the development of these 

 animals, displayed in the foregoing exposition, applies not 

 only to Cam/panularia, Plumularia, and other Tubularice, 

 but also to the Sertularia. But how far the aggregated 

 Coralline polypes may be explained in a similar way, 

 namely, by supposing them to be a colony of imperfectly 

 developed individuals, whose aggregation has for its ob- 

 ject the complete development of individuals of the same 

 species, must be determined by future inquiry. 



