IT 



PHYLUM CCELENTERATA 



199 



Fig- 147. — Pexmatula sulcata. A, entire colony; B, portion of the same magnified. 

 /. lateral branch ; p. polype ; s. siphonozooid. (After Koelliker.) 



po- 



Fio. US.— Tubipora musica. A, skeleton oi' entire colony ; B, transverse sections of polype ; 

 ('. sinple polype with tube and commencement of platform ; 1), growth of new polypes from 

 platform. /. m. longitudinal muscles ; pi. pi. polypes ; pi. platform ; gfjph. siphonoglyphe ; sp. 

 spicules ; std. stomodseum. (After Cuvier, Quoy and Gaimard, and Hickson.) 



