122 



MANUAL OF ZOOLOGY 



SECT, 



FIG. 61. A, B, two views of Flabellum curvatum. Natural size. C, semi-dia- 

 grammatic view of a simple coral; D, portion of a corallite; E, F, diagram of a 

 simple coral in longitudinal and transverse section; ectoderm dotted, endoderm 

 striated, skeleton black, b.pl, basal plate; col, cplumella; e. th, epitheca; gul t 

 gullet; mes., mes. i, mes. 2, mesenteries; mes. f, mesenteric filaments; sep, 

 septa; /, tentacle; th, theca. (A and B after Moseley; C and D after Gilbert 

 Bourne.) 



