TEE MEANDRINJE. 



2o:j 



to spread successive accuuiuJations of calcareous 

 matter." 



[Iha poriteSy or poritidiBf belong to the same gioup, 



Fig. 41. — Meaiidiiiia CVieb 



nnd are amonsf the number of polypiers which often 

 attain very larijo dimensions. Their substance is 

 calcareous. Their surface is riddled with pores, or 

 rather little shnllow cups, in which the living polyps 



