Philosophical Transactions of the Royal Society of London, Volume 174,Deel 3

action amount animal appearance arrangement axial axis become blue body buds cause cavity cell-wall cells cent citron band cleavage closely colony colour completely condition considerable contain continuity critical definite described determined diameter direct divided division dorsal earth eddies entirely entoderm examined existence experiments extend fact formation four further gauge gave give given lamella larva lateral layer less lower marked mass matter means membrane method motion nearly nuclei observed obtained occurs pipes Plate polyps portion possible precipitate present probably produced protoplasm quantity radials relation remains Renilla resistance rest seems seen segmentation separated septa septum sheep shown side similar solution spectrum spheres stage stained stomodæum structure substance sulphuric acid takes temperature threads Trace treated tube usually velocity ventral wall zooids